How do I make friends?

Hello! I’m 19F and I am struggling hard to make friends around my age. I really want a big social group but it’s really difficult for me because I’ve always had social anxiety and everytime I make a friend they eventually abandon me or turn out to be a toxic person. I also have a tendency to latch onto one person and put all my effort into that one person until they eventually leave me. Right now I have 2 friends

• my best friend ( who has been texting less and less every day because she’s so busy) who’s been growing apart from me
• my other friend who is nice but I’m not as close with her as she’s a bit emotionally immature
There great but they both live in different states so I can’t really do anything with them or talk to them often because there both busy

And here are some of the biggest reasons why I have a hard time making friends
– I work 8:20-3:00 at a public school
– I have college tues 6-7:45, and Thursday 6:-8:45
– my schedule at the school I work at makes it so I can’t join any clubs at my college because there all during school hours
– all the people in my college classes are older than me or give me weird vibes
– can’t really make work friends cause everyone’s 20+ years older than me or a literal child
– I have interesting hobbies ( reading, crochet, art, etc ) but I don’t post them much online because of my worries

So, what do I do? How do I fix myself? ( and sorry if this post is a bit messy I’m pretty new to Reddit)