Why does sex hurt at the start

Hiii everyone. I don’t have sex that often like maybe once or twice a week, and whenever I do it always hurts the inside of my vagina right at the beginning. It really hurts and he always has to go slow to start. It feels like it’s still stretching out. After a couple of slow strokes and A LOT of pain, I’m fine and enjoy it. Is this normal? its not from a lack of wetness because we use lube! Please let me know if this is normal and or how to fix this. Thank you!