[An Eccentric Cellist]

If your friends are so insensitive as to make fun of your virginity than they are shitty friends and you should get some new ones. Preferably nicer.
If guys are making advances on your person during or after knowing/realizing you're a virgin, get the hell away from them as they are trouble.

I'm taking it that you're female. Staying a virgin is perfectly fine if you're happy, don't take crap from those who poke fun at it and aren't just kidding, it's rude, personal and none of their business.