I think you should seriously try to move your computer somewhere else and avoid doing thing that put you in an excited state of mind before going to sleep. I sometimes had insomnia because of videogames - believe me, it can really happen.
If you cannot fall asleep after a while, get up and do something else relaxing. Like reading a good book, drawing if you like to draw or putting your hands in some activity....that kind of things.

But don't, don't start taking slleping pills. If you start so young, you'll never get rid of them. Believe me, I know what insomnia means.