i can't be myself around the guy i'm in love with...

me and my boyfriend have been together in a long distance relationship for 1 year and 5 months and i still can't be myself around him.

I don't know what it is but everytime I see him I feel like we just met or something and I want to be myself so bad.

It eats me up inside everyday because he loves me so much. He just doesn't love the real me.

Anyway eveytime I'm around him I feel like I can be myself but then somthing starts to pull me back and I just can't to do it, but when we're alone I feel like I can be myself the most.

Why is that? and what should I do??