Yes it is and yes it can. If you already have low confidence and pain, why would you hurt yourself even more?
If you are a teen, remember that the teen years are the absolute worst time of your life. I am surprised any of us survive it. You are struggling with so much stress, pressures, changes... Your body and mind are trying to cope but ... its hard, dealing with unpredictable hormones and roller coaster emotions.
The brain is a very complicated and delicate thing. It can get messed up and be unable to produce any or enough serotonin. This is called a chemical imbalance which is easily treated, very common and nothing to be ashamed of.
It can cause depression, anxiety, panic, obsession, self harm/self hatred, suicidal thoughts, eating disorders, sleeping problems, aggression/rage, anger, phobias, fears, helplessness, hopelessness, hypochondria, ADHD, paranoia, OCD, headaches, lack of interest in things, lack of motivation/ focus and much more.
According to those who went to therapists, it doesnt help much. They are not even allowed to prescribe appropriate meds to help you get better.
Tell a dr. about all this and ask him for anti-depressants. Zoloft/Sertraline is a good one; most people thrive on it and it has no side effects. It enables the brain to function property. With antidepressants, you will be much better, happier, calmer, confident, relaxed and feel normal. What a difference it makes!!
Continue taking meds even when you feel better. You need them, so stay on them. And good luck to you!