Is hurting during sex normal?

Whenever my boyfriend and I have sex, it hurts. It feels good, don’t get me wrong... but it also hurts so much for a while before it starts to get better. It could be because his dick is very large, but I really don’t know. I know that lubrication isn’t an issue, because when he gets me going it’s like a waterfall down there. I also try to stay as relaxed as possible when we’re having sex. I just don’t know why it hurts. I appreciate any feedback I get, thank you all! :)

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