Long story. I'm officially diagnosed though and as a kid they thought I had autism because I've always been anti-social and would just sit there lining up objects all day.
I hate e-diagnosing neckbeards and attention whores. I get the whole argument about "not everybody has healthcare"! but 1.) If your behavior were really that different from the norm, the system would have diagnosed you (at least with something) as a kid, and 2.) You could have a lot of different things, or nothing at all. That's why diagnosis is best left to a professional (even though many of them admittedly do believe lots of bluepill bullshit)