The Major problem of the teenagers is that they can't find people who will give them adequate love and care. They want a shoulder to cry on a ear to listen to their problems. And when they don't get these, they get into depressions. And it is really hard to come out of that depression. they can't accept the reality and hence tend to cry over the spilt milk.
So what is the solution? Live your life to the fullest. Try to avoid getting into troubles which can bring problems to you. Keep someone who will listen to you. If you don't have someone take the help of a personal diary(it is really a good listener.) Try to involve yourself in activities like reading and writing. And after everything keep faith in yourself. Always believe that there is light after darkness. There is always a silver lining even to the darkest of the clouds. Try to smile even in the hardest of the time and remember these few lines:
Time can bring you down
time can bend your knees
time can break your heart
but behind the door there is peace!
After all this is your life and no one has the right to spoil it.
Cheers to life!!!
Please do read the link posted by Shubhabrata da as comment.