only one?

Am I the only one who always feels used by guys? Someone could be really into me and I'd think" nope, you're using me, you have a gf"(although they don't), and guys with gfs always show interest in me. It's becoming a problem for me bc I push people away and wonder why I'm still single or whatever. I'd always question guys I'm vibing with. I lose interest in them very quickly as well and rarely have crushes on guys, which is super weird.