Don't panic. I was 19 when I lost my virginity.
Nowadays we are bombarded with sexual imagery and live in a culture that values sex above almost everything else. Magazines and TV push sex at every opportunity, and it can sometimes seem like the whole world is a throbbing mass of sex. It's not true... there are plenty of people out there who don't have sex, or don't have sex very often.
If you feel frustrated, that's fair enough, but don't feel pressurised into having sex just because you feel you ought to, or because you think everyone else is doing it. Relax, socialise, be friendly to people... chat to girls (or guys, if that's your thing) and it'll happen.