Hello Sir. I Am In A Serious Problem...i Cant Shared

Hello Sir. I am in a serious problem...i cant shared it with anyone... but i want to sort out it. my problem is that when my husband insert pennis in my vagina i feel much pain even tears come out from my eyes. Even he used lubricant on his pennis and we play a foreplay for long time...And i aroused from it and i have orgasim but at the time when he insert his half pennis i feel pain. i am very affraid of. Plz tell me what i should do?