How do yall make friends?

I was diagnosed 2 years ago. And I guess it might be the reason why I’m bad at social interactions. How people make friends is genuinely still the biggest mystery. I was all right with it in the past but live becomes depressing pretty fast when you’re completely alone. I really want someone I can spend fun time with and who I can bond with. The only place where I ever was with other people is school and uni. I tried a lot to be friendly and talk to other people. But it’s always either that they’re avoiding me but then after an interaction say that I’m actually a very interesting and cool person but never try to talk to me again and when I do get closer to someone they just don’t try contact me anymore and I don’t know how to start a conversation first, and I don’t know why. Perhaps I’m generally bad at conversing, maybe I don’t understand other humans. And how to even meet all of these people outside of school? How to even just walk up to a person and start talking? I tried looking it up on the internet but nothing worked. It feels so lonely, going around and seeing all people in groups, not knowing why on earth I can’t manage to have that. And I genuinely wonder how people make friends. I’d love to hear some advice.