Depression - Teen Support Group
Teen depression is marked by persistent sadness, discouragement, loss of self-worth, and loss of interest in usual activities. Depression can be a temporary response to many situations and stresses. Teens may be more susceptible to depression due to the normal maturation process, the stress associated with it, and conflicts with parents as they become more independent.
I'm not sure if you believe in God but there is this expression "Let go and let God" and it's all about letting him take care of the things you can't control. Once you go that you'll feel a hell of alot better.
I hope this helps!