Why does it hurt when I have sex?

Each time I have sex with my boyfriend it hurts even when I’m trying to be relaxed and I don’t understand why because my friends don’t have this issue and they seem to enjoy it but I don’t. My bf likes to do it from behind every time and it feels like he’s going in too deep causing me pain and when it’s over I have... show more Each time I have sex with my boyfriend it hurts even when I’m trying to be relaxed and I don’t understand why because my friends don’t have this issue and they seem to enjoy it but I don’t. My bf likes to do it from behind every time and it feels like he’s going in too deep causing me pain and when it’s over I have to take Tylenol because im usually so sore. I tell him when it hurts and he makes it seem like I’m being a baby or make me bite the pillow and I’ve tried being open minded and relaxed it doesn’t work... why does it hurt and how do I stop that from happening?
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