For me, the problems have been coming since elementary school. High school only added to the problems but I found myself alone, marginalized and rejected. It was the law of the jungle with teachers who did not teach and were not interested in enforcing the rules. It was a disaster and I had to drop out because of intimidation, even if not physically. It was like being in a prison.
I was not constantly bullied but some kids did sneer and insult me time to time. I was invisible to most girls but when they had to acknowledge I existed they were uncomfortable. I was always on alert and conscious as to whether I did anything to embarrass myself.
I was extremely unattractive in high school but naturally have a bit of an outgoing personality so I coped by jestermaxxing which made me tolerable to most of my peers even though they all thought I was a bit weird/clowny. Wasn't ideal but could be much worse tbh. I had a few friends I hung out with but they weren't particularly close friends and I lost contact with them as soon as I dropped out of school. I was a bit socially awkward as well.
Interestingly enough people still find me a bit 'weird' even though nowadays I'd consider myself above average socially. I think it's because I have unusual opinions and not as much of a filter as others.
Yeah, I choose not to though. I guess it depends on how you define 'social skills'. For me, social skills is being able to enjoy and express yourself while still being generally liked or at the very least tolerated by the general public or your surroundings.
I'm NEET now but I've worked 2 jobs in the past, I'm pretty sure if you'd ask my colleagues about me back then most of them would go 'oh NEETmax? yeah he's okay, a bit of a character but still a good guy'. I'd consider that pretty successful considering I wasn't straining in these interactions and just kinda acted as myself.