I am in love with a guy I know I won't have. What should I do?

Just enjoy what you have and leave it at that. You may find that it's not that exciting once you are out in the open anyhow. These are the best loves, short lived ones. Don't get me wrong, being in a committed relationship is also really good. If it's meant to be, love always finds a way. Enjoy the ride. Experience life and all it has to offer. I'm sure others may judge you but you only live once, just don't be suprised when the shoe is on the other foot somewhere down the line. As long as your ok with that, go with it.