I Dont Know Who I Am Anymore

I was always so sure of myself. I knew that I was strange and very selfish in general, but I could accept it. I knew I shouldn't have been doing what I was, but I liked doing it and talking to them, so I did. And I don't regret that. But now I'm 20 and I feel stuck in a rut. I don't have anyone I can really talk to except my love, and that's different. I just feel very lost and alone. And more unsure of myself than I ever have been of anything.