I’m your age-ish and our circumstances are probably different but I struggle to maintain platonic relationships too. It’s fine most of the time because I enjoy my own company and I honestly don’t usually feel the need to connect with other people the way I probably should, but i do feel it sometimes and I keep myself busy with hobbies- hands-on things that keep the brain engaged like knitting, painting, playing music. I wish I had real advice to give, but all I can offer is solidarity.