I'm so lonely vent

I'm lonely and i hate it. I have one single friend, that i can't see every day bc we are in different universities. All the "friends" i had i highschool barely talk to me. I have a gf, but things have been feeling weird with her, it doesn't feel the same.the age gap of only 2 years is starting to show and it almost makes me feel uncomfortable (I'm 20, she's 19) when it wasn't an issue before. I might have finally matured, besides we haven't seen each other in like a month (it's not a long distance rls). Anyway, aside from them i don't have anyone, i barely leave my house if it's not to meet either of them, my classes are online so i don't have to leave for that either.

I genuinely don't know how to make friends, i try to st least online, but it seems like no one wants to. Ire actually sad to see my best years fly away while I'm in my room bc i have no one to hangout with.