Breathing difficulties while running?

When i hear others breathe heavily after running, their breaths are much deeper. I feel like I can't breathe in all the way and my throat feels tight. I have anxiety/depression (if that helps). Also, when I was in 6th grade, my nerves sped me up in a lacrosse game. Now, I'm a freshman and when I get nervous before a game, my nerves slow me down and I feel weak. Anybody know the problem?