Down a size

So I recently got into a relationship and his penis size doesn't compare to my ex and I feel really bad that I'm actually admitting. To this but the sex is alright . . That sometimes I miss my ex only in the that factor idk if anybody else been in this situation but it's really been bothering me and idk what to do or how to improve the sex. He's a great guy and all but the sex is boring. Ladies what you think ?