The fact that you are here living and breathing on this Earth means you are lovable. God is love. He created us out of love so we are lovable. Noone elses opinions matter except Gods. We could have been made a tree or a flower but we were made human. God loved us enough to give us life. What we do with it is up to us but he created us from pure love and when we mess up God still loves us. When we do good God loves us. He is always loving us. So don't take on other peoples labels of you. Believe what God says about you instead. Who is some other random person to say if we are cool or lovable or whatever their opinion is-who are they? Don't try to prove yourself to others only care about living a life as a ambassador to Christ. He is the only one we need to prove ourselves to.