I would recommend of finding the reason why you feel like you feel, and to really confront it , as you are young and beautiful and you have many years ahead of you in witch you can be very happy. Start to talk with yourself , and try to find the real reason why you are so disappointing. And not the overall reasons as nobody loves me and bala bla bla, but the real reasons, witch are there in you. Be true to yourself and everything will eventually be good with you!! Do the talk it really helps, just don't lie to yourself !!!