Low self-confidence leading to depression ,loneliness...........

Hello.I'm a 20 years old guy and am studying at a college .Throughout my childhood i was fat and so naturally was picked on by everyone.Ever since then i have this perception that i'm "ugly".It didn't affect me while i was in school,instead it motivated me to become thin.Now i am at a college where the richest kids and the prettiest girls of my nation study.I have a poor self image,as i still feel my looks are appalling .To make things worse i have terrible acne and a dull skin with a wide nose which makes me look like i came from some dirty African country.(I hate my forefathers for the genes they gave me).I get nervous around girls,cannot have a healthy conversation with them and this retards my social life.I'm seeping slowly into depression and even get suicidal thoughts.I'm a national chess player and was really good at academics,but now i just feel like a failure.I'm no good at anything.My self esteem is so low that i cannot even make an eye contact with girls...Feel like crap...