Advice for an introvert that want some friends

I'm 17 and never had a true friendship. Since my childhood ive only been around people and not with them. In elementary school I did talk to others but I had more fun reading books (a nerdddd). In middle school i started to avoid the other kids. I knew that I m not straight and my classmates were homophobic since we were in a religious school. I couldnt really be myself back then. They made fun of me bc of my hobbies. One girl "accepted" me but she was only talking about her and i was like her "faire valoir" (idk the word in eng srry). I changed school in 10th grade and started to not give a sht anymore. Everyone know that im a gay "otaku". But nothing change even if I accept myself. People avoid me. I dont talk with anyone except fot group work. I try to be into mainstream stuff to be friend with some people but i get tired easely (since im not interested by their stuff). Online classes helped me a lot to not deal with others. But since i dont have sibblings i feel really lonely at home... I took some therapy and they advised me to search online friends, like on discord but... Idk. I ve got on the weird side of it maybe (i met child groomers and some weirdo). At this point im tired of my life, im only 17 tho... I wanna stop existing but i dont wanna diie. What should i do?