The same thing was happening to me. So many thoughts running through my head. It was hard to concentrate. But the more I practiced it, the more my mind was calming down. I am not sure if you had a teacher to guide you through the process of meditation, and he helped me a lot. Now I meditate daily when I am upset or not because it calms my mind down. My meditation is a form of breathing and affirmation.
It is hard to do it on your own. You are really just shooting in the dark. It is why you are probably having a hard time getting results from it. Maybe you should try to find a teacher at least for the beginning until you learn the basics? :)