Help!

So I just got divorced a few months ago, and I'm dating this really amazing guy! We just had sex for the first time and I was a little disappointed in his size! I know it's unfair to compare him to my ex, because my ex was like 7 inches so way above average, but it just didn't feel as good because it was significantly smaller! And I am just scared that I it won't be as intimate and I will have to fake that it feels good so it doesn't hurt his feelings! But I don't want to fake it! What should I do?!?