The only thing that takes a girls virginity is a mans penis.
Sometimes a girl will NOT bleed her first time, nor will she have any pain.
The true definition of losing virginity is when a penis enters and penetrates your vagina and sexual intercourse takes place for the very FIRST time.
There are things that can happen during your FIRST sexual intercourse.
a) if you have masturbated and have used objects and toys that are large enough to stretch your hymen, you may not bleed when penis inside vagina intercourse takes place for the first time
b) you may have a very tight and unstretched hymen that is most likely to tear with very very minimal bleeding. Hence the benefit of using Lube for the first time is always advisable. That helps and facilitates sexual penetration with the least amount of trauma and "pain" I was 13ish when I lost my virginity and I didnt feel any pain at all. The bleeding was very minimal too. So, everyone is different. Experiences differ.
c) your hymen may have already torn through sport, or extreme exercises. Hence, you may not bleed when you have intercourse for the very first time.
Bleeding with your FIRST sexual intercourse is not a sign of being a virgin or not.