I am 36yr old female , and on fourth day of my periods I had sex with my boyfriend , I was a virgin before that it was my first time , we did foreplay and when while we were having sexual intercourse he wasn't able to enter in me fully I kept shutting we tried different positions but nothing worked he still couldn't enter into me fully , we even tried couple of hours later still no progress , and even though he was in me half it was till painful , he even used lubrication. I don't know why is this happening Is there any problem with me or what is going on , please let me know what exactly do I have