I cant sleep well??????????

I used to worry a lot even for small things.worrying and thinking about the things happend to me on the day becomes my habit.my mind is racing.My eyes become dull and dark.am a teenage girl.I believe in god.I used to pray daily .But i cant get good sleep.Things happened on the day comes to mind now and then make me not to sleep well.Frnds hel[p me ............