How could I relax and act normal with a guy I like?

I started liking him when he was the only guy in my grade who stayed for the whole school dance because the rest of them were boycotting it. I’ve managed to act normal so far, but yesterday my friend said he amitted to her he liked me back! Things pretty much never work out like that for me! Now I’m so nervous to talk to him and I don’t know how to just act normal when I’m nervous! Any ideas to CALM THE NERVES and manage to act the way I had before?