I am 16 and have taken two girls' virginity. Dont do it to be accepted, because it will be a disaster and you will just end up crying about it and worrying everyone around you. That, and it's just plain stupid to do things like that because you are worried about how people look at you. Just be yourself, no matter what anyone thinks.
But anyway, the first experience taking a girl's virginity I also lost mine and she was screaming from the pain no matter how gentle I was and we had to stop. The second time... well. She had a heart-attack. That was just 2 days ago and I'm still depserately trying to get medical info because it was very scary.
Long story short, dont do it unless you are at least 15, you have a close friend to do it with, prefereable with a little bit of experience for your first time, and unless you are happy to do it.