Struggling to Make Friends After Recovery

I’ve been so long on my recovery from ending up in the hospital for such extreme depressive episodes that I feel like I’ve lost my touch on how to make friends. Of course as people go to college they drift away and you’re supposed to also do the same and find new friends, but that was a whole swing and a miss by me. It’s been almost 2.5 years now and I feel like I’m annoying my once friends that I still reach out to because they say I’m the only person they still talk to from high school. I haven’t made any new friends during the past 2 years and even though they may not feel the pressure, sometimes there’s only one person I’ll talk to over the course of the week and that makes me put an invisible pressure on them that I think stresses them out (it doesn’t) since they are the only people I’m talking to. Sort of like I’m putting a responsibility on them that they don’t even know they have. How do you stop those sort of thoughts? Also, the original question I was meaning to ask was, how do I push past the boundary of acquaintance to friend? I haven’t done it in so long that I don’t know if I remember how I made friends in the first place.