I should preface this by saying that for most of my life, I was assumed to be autistic and thus was taught that I'd never really be able to make friends and keep them. In reality, I can usually understand social cues just fine, I just don't know how to act because I moved around so much when I was a kid and thus never really learned how to act around other people.

What would be the point of being friends if I was going to have to say goodbye anyway?

Most of the people I call friends? At most, I'd say they're acquaintances. I do have a small circle of very close-knit friends but I'm realizing that I can't just rely on them forever. But I don't know how to ask people if they want to hang out, join an ongoing conversation or ask how to join a group of people hanging out without fearing I'm going to get rejected or told to scram. And like most people with BPD, I'm terrified of rejection/abandonment.

So how do I talk to people?