Is it normal for a guy to still be a virgin at 20?

ok, i am 20 years old, and i am still a virgin. I mean girls are into me and all. i just cant get them. i never had a opportunity to get laid. and it has been eating at my self esteem and my confidence. I wake up nowadays angry, and i go to bed depressed. I have been in a boarding school for five years, and all of my friends from back home had moved on with their lives. I feel as if my life as been drifting me by; let alone all of the miss opportunities had drift me by as well. I have been single now for over a year. I am not into any of the girls at my school at all. I mean I'm good looking, but the problem is people look at me, in other words assuming as if i have done it before. That is for "DUDES" and "GIRLS"- I have put so many bricks up in my life, and i have not opened up to a lot of people, including my own parents, i do not tell them a lot of things that i go through in my life. Can anybody give me advice to becoming happy? and what i could be doing wrong? I find that being a virgin is a curse. - I can't stand being a virgin still at twenty. Not a gift for me!