I agree. I'm also approaching the dreaded 30-year-old mark and I feel the same as you. It's a strange kind of bittersweet melancholy that washes over you. You start to fully realize and completely accept that it is indeed all over. Even if you could salvage your love life at some point in the past, you passed the point of no return a long time ago.
When you're in your teens / early 20s you feel a massive sense of urgency. It's like you HAVE to act RIGHT now or you will miss it all out. Men that age, me including, oftentimes go on a hellbent spree trying to looksmaxx as much as possible. Guys will do anything to improve their SMV.
But then you're closer and closer to 25 and nothing helped. You didn't get anything, and suddenly you're closer to 30 than to 20. Your youth and your prime are over and they sucked. The best part of your life is now behind you, and you didn't even get any enjoyment out of it. You're going to spend the next 40+ years in declining health either working or living on a dole. Things won't get any better and you're too old to keep lying to yourself that there's a bright future ahead of you.
You're not missing out anymore. That ship has sailed. It's past tense now. You missed out and it's over. Then that massive pressure you used to feel when you were in your teens and early 20s is gone. Nothing you can do now anyway. Nothing will fix the broken mess that is your love life. There's no easy fix. In fact, there's no fix at all. You missed out on too many crucial development milestones.
It's kind of like when you're late for an important appointment, maybe a job interview or something like that. You're panicking. You're hurrying. You're stressed out to the max but then you look at the time and you know you're way past the point where you could still make it. It suddenly all goes away. Yeah, it fucking sucks that you missed out, but what can be done at this point? Nothing.
It's a sense of bittersweet fatalism that never goes away.