How to make friends and get in a relationship?

Hello, I (20F) dropped out at 16 and gradually lost the friends I used to have. I was diagnosed only two years ago and I struggle with a lot of things but more importantly making friends and having a social life outside of my close family. I'm a NEET at the moment, never had a job and I don't go out because I live in the countryside. I spend my time on the internet but yet I never make new friends. It's like no one is interested in me, even when I'm on servers that are about my hobbies. I don't have issues with texting (I rarely go semiverbal) but I do tend to get scared or anxious, and ghost people. I don't know what to do.

I wish this soul crushing loneliness on nobody. I really want a boyfriend or girlfriend as well as new friends, but I don't know where to look. I also don't do casual, I want serious relationships, platonic and romantic, which seems to be increasingly uncommon for my generation.