Most Helpful Guy
What distant said sums it all up in a nutshell.
He chose to date you for a reason, It means he finds you attractive and you seem really nice in the process as well.
I had an Ex who was also self conscious to do anything with me because she was a bit bigger then me and it didn't really phase me because she was gorgeous in my opinion. Of course we all are a bit insecure about ourselves but try to relax when your with him, he's happy with you after all.