Struggling to Make Friends? Here's What You Can Do

Yes

Yeah. And once everything is going great they show a nasty/problematic side of them I never knew and we eventually have a falling out. :( It always seems like they're always hiding something to make friends and when the time feels right they test the waters by saying something disgusting. I'm not sure what to do anymore.

100% its in the diagnostic criteria for a reason. Its like one of the most common symptom across the whole spectrum. Youre not alone. But its not a permenant obstacle. There are many places, like this, with many people who can empathize with you and are also looking for friends. It might be hard but its not impossible and it doesnt mean anything negative about you! Just dont give up okay? Start small by asking a conversation starter here to instigate people wanting to talk to you. You could also look up servers for discord on the site disboard for ppl like you or that share your interests. Theres even groups on facebook.