To find out if it's still vigem, go to a gynecologist and ask him to check if your hymen has already been broken. The hymen is a thin membrane located at the entrance of the vagina and usually breaks at the first intercourse.
If the hymen is broken, it is likely that you already do not be a virgin, that is, he had sexual intercourse with penetration.
If the hymen is still intact, you may or may not be a virgin. The presence of the hymen is no guarantee that there has never been penetration.
This is because compliant hymns, which are well elastic and may not break early in the first relationship. Others may have an anatomy that allow the passage of the penis and will break only after a while.
So, even if the gynecologist can see your hymen, only a frank conversation with your boyfriend can take away your doubt.
Read more about it in:
What is the hymen?
How do I know if the hymen has been broken?
