Don't worry, I'm 20 and I've never kissed a guy or done anything else. It's not like I don't like guys but I'm very shy and went to an all girls school my entire life so I don't really know many boys either. Any boys I've ever liked (and there's been about 3 of them and thats it) have never liked me.
I don't like the idea of getting off with a random person in a pub/club, because that's what my friends have encouraged me to do too but I'm not comfortable with the idea at all. I'm seen as a bit of an oddity by my friends and family, but I reckon it'll all just happen when the time is right. But I do think it gets harder as you get older. Chin up, you're definately not the only one! xxx