Plzzzz help me?

i have a problem....mostly i feel socially rejected like when i was in school in the first years of school then some students used to make fun of me because of scars and abnormality in my neck and chest cuz of operations i did cuz i was born with cystic hygroma and even when i was in grade 12 in school...there was one guy who used to pick on me and i wasn't accepted much in cl and i have this idea that most girls don't like me....i have girls that i talk to them on msn and phone and see them too as friends but i never had a date as a bf and gf and sometimes this makes me feel depressed cuz i feel i need a girl so bad to love me...valentine is near and i don't have any...i never had a girl for valentine....and mostly iam lonely and that caused me to be aggressive and have doubts about myself sometimes....and sometimes i feel normal and happy...plzzz help me....what should i do?