Help !!

I just recently got into a new relationship, let me tell you, he treats me amazingly well. He pays for my nails, he takes my parents out to breakfast/dinner, he’s an amazing person all around. We attempted to have sex for the first tome today. I’ve never even seen his penis before today and I found out tonight that it is a least 4 inches, he wasn’t able to leave keep it in without it falling out. I know sex isn’t EVERYTHING in a relationship, but I do believe it’s a big part of it. Idk what to do. HELP