Hi I'm 19 Years Old And Was Wondering... When Having

Hi I'm 19 years old and was wondering... when having sex with my boyfriend why do I always feel this massive pain when we now start? I don't know why and it feels like when he's taking your virgin everytime. I've noties a piece of skin at the opening of my vagina it's like an inch long, I try looking in the mirror to and as soon as I spread my leg there's that skin hanging out right at the opening, I can't be able to see the opening of my vagina. I hate that it hurts everytime we have sex please help me is it because I strained myself made that long skin came down would it affect me from having kids? HELP!