I really like my friend who doesnt know i am gay.

So, here it goes. Noone knows that i am gay and i've got a crush on one of my best friends. He has no clue. He's a bit smaller and has these amazing brown eyes and i've got some kind of a fetish for small people. I act as normal as possible, but sometimes i cant help it when being in a car together or lieing on a couch or when changing in sports class... We're going on a week long trip together in a month and ive got no idea what to do without making it akward? Do I tell him?