People probably think I'm retarded for treating this video as gospel when it comes to creating music, but I think it summarises how it works exceptionally well:
View: https://www.youtube.com/watch?v=fMDr_luEqS8
For the vast majority of musicians the above is quite simply how it works, to a great degree at least. Only a select few can create music using only piano rolls or scores, and that goes for musicians who are adept at various instruments too. My advice here is not to stray away from things like music theory and sound science because that stuff is sick and super useful too, but the above mindset will get you very far. That video explains the most important principle in all of music, namely that "if it sounds good, it is good". I'm sure that you will find that a surprising amount of your favourite musicians have little more knowledge (or a traditional understand of music theory, that is) than what that above video shows. It is also especially important to remember that people are still humans at the end of the day and not some kind gods, like the late Terry notes in that video.
Try to get a hold of some instrument you could play, if you have no idea what you would want to play a MIDI keyboard would be an excellent place to start. A a simple two octave keyboard would be more than enough for a beginner, if that would be too much to spend you could even use your normal computer keyboard as a MIDI keyboard. You wouldn't have velocity sensitive keys if you did it that way, but most DAWs have that function. Another option would of course to play software instruments on a touchscreen device, using free apps like BandLab or GarageBand.
Just mess about with those and see what happens, and remember to record what you're doing. Most of what you will be able to come up with won't be that good, but I'm sure that you will be able to come up with some things you do like that way. If that isn't too fun in the beginning you should try to learn to play some songs/tunes you like, because that will make it easier to improvise things you like hearing. There is a caveat to this though: trying to learn to play or recreate somebody else's music exactly like the original is a fool's errand, so don't beat yourself up over it if it is difficult. Studying anyone's music (or even your own music eventually) is yet another infinite process, there is always more to learn, and that is again one of the wonderful things about music. Therefore you shouldn't feel the need to perfectly master other people's music, as fun and interesting as that can be.
In my opinion creating your own music is the most fun because that is where you get to set all the rules, and the main reason for studying other people's music should be to inform that. Interpreting people other people's music in your own way is also another option, even if that's because you don't yet have the chops to play the original exactly like it is. Anyways, once you have some of your favourite songs more or less under your fingers you can go on to learn about what things like notes are, then scales and chords, eventually followed by exciting stuff like modes, rhythm, song structure, instruments and audio in general.
I will also say that "muh rote practice and shieet" is vastly overrated, and it is a trap that you can fall into. In my experience you don't need much of the rote, Whiplash-esque practice "tuff" normies rave about all the time at all. Study is forever though, and that might be considered practice depending on how you look at it. What I am saying is basically that you simply just do whatever it is you need to do in order to be able to achieve whatever it is you want to achieve. Some rote practice and memorisation will of course be a part of that every now and then, just don't treat it as a religion or something you have to do. Once you get comfortable with doing anything really I imagine that a simple warm-up will be able to get you where you need to be anyways (basically playing anything you want, or something you are comfortable with, for example).
As for hobbies in general you kind of have to have the right neurodivergence for it. Most incels and truecels do not have a natural givenness for anything, the fact that they were able to get anywhere with a hobby is purely because they can or could have a ton of fun with whatever they were doing even when they sucked at it, and when I say suck I mean genuinely sucked at it (or even still sucks at it). Part of being able to be happy with it comes down to being absolutely stoked about the things you can do, even if that is very few things. You absolutely need to be able to have that kind of appreciation for the things you can do, and not curse yourself for the things you can't, even if those are things you would want to be able to do as well.
This is going to sound like boomer-tier nonsense bluepill advice because it is but you can't rush things either, and you do actually naturally get better at things over time (even if it might seem that you did nothing in order to improve). Part of sticking to it also comes down to appreciating a wide assortment of music, and how there are a ton of things which are unique and worth hearing, including whatever your own abilities are able to do. This might be my most boomer-tier advice of all, but I also believe that there is more for people without at natural givenness in something to gain in an interest than there is for talented people. Because you don't immediately get something you might get to learn more about it than someone with a natural givenness for it would, since you would need to and the talented person wouldn't, for example.
You basically have to count whatever playing toolkit you are able to develop as a blessing, and the fact that you have reason to spend a lot of time learning about music as a blessing too (or whatever it is you're learning). Even having as little as an interest in anything at all should be considered a blessing really, because a scary amount of people in life don't seem to have even that much. We incels especially need to consider never-ending copes like these treasures in our lives, since there usually isn't much else going on in our lives.
...All of that is assuming that you would face some difficulty with it if you were to pick it up again though. For all I know you could be a genius who just haven't gotten his due with music yet. I know I didn't give you too much practical information, because unfortunately I have to hold back on that stuff, but hopefully some of my ramblings here could prove useful to you. Things like music are things only a few people in the world truly understand and appreciate so I'm always happy to see people who seem to be genuine fans of it. For normies things like music are just a means to an end for gathering resources, maximising social status and lust for sex, as is anything they do.
TL;DR: My ramblings on how to keep a good mindset when it comes to things like creating music and hobbies. Read at your own will.