If you like him, and you want just him to know it, then go for it and tell him! Don't be shy because confidence is more beautiful than makeup. And don't be ashamed if other people know you like that person, their your feelings and not anybody else's. But if you are still kinda shy be flirty about it and not just blurt it out. Ask if he's interested in somebody, or name characteristics that you have and see if he reacts. A smile is always a good sign but don't pester him with questions like that cuz it'll ruin it.
someone did that to me, but didnt say they didnt want any1 to find out. So, I told my closest friends, and the next day the word was out. He's mad at me now. I would suggest you keep it to yourself for new, but if you start wanting him to be your boyfriend then try to work up the nerve. Good luck!