What makes a loser?

Well I’m a senior in high school, I have three close friends- one who I’ve been friends with since 3rd grade (and she lives in a different city), my really nerdy friend who I’ve known since middle school, and my ex who I’m still really close with. I hardly ever see them though, and I’ve lost a lot of friends this year too b/c they were users who asked me to do stuff like drive while baked and some guys that only wanted sex from me. so I chose to cut these people out of my life… and I’m left spending most weekends by myself. I feel like a total loser. plus, the friend I’ve had since third grade, is really selfish . I feel like this is all my fault and like there’s some reason I’m alone a lot. am I a loser? going away to college out-of-state in a few months, so maybe this won’t matter so much anymore :P