SEX LIFE HELP

Sooo Idk if this Is only me but i only have sex with one person and that’s my bf and I don’t know why it always hurts when he first puts it inside ! Like I swear I’ll be turned on and everything he says I’m wet I feel wet but maybe not enough? I have no idea all I know is that everyone be talking about how good the feeling of when a man first slides it in feels but for me it hurts like a bitch .. then when he finally puts it in I’m good and it feels alright but damn. His dick isn’t small but isn’t thattt big either it’s pretty average and I’m guessing thick since it hurts!