Yes, it’s normal for teens to be worried about the future, to feel under pressure to preform in school and to feel down at times. But your letter suggests something beyond the usual concerns and feelings of a 15 year old. For that reason, it would be sensible for you to see a counselor who can sit down with you and hear your whole story. It maybe that you just need some perspective. But it could also be that you are suffering from a treatable depression.
I’m also concerned that your sleep cycle is disturbed. Do some research on sleep disorders. It’s possible that at least some of your distress is an outcome of too little or too irregular sleep. If that’s the case, a counselor can help you learn relaxation techniques that will help you get back into a normal sleep routine.
You made a positive first step by writing to us here at PsychCentral. Please take care of yourself and take the next step. Talk to your parents, a trusted teacher or school counselor about how to get an evaluation by a counselor who specializes in adolescents. You deserve it.
I wish you well.