Vicky,
It takes a lot of guts to ask such a question. You really are a sensible person. Not many people are able to confess to this problem at your age (you are my sister’s age). Pray to god (whichever devi or devta you believe in). Try to fast on the day of that devi/devta (example monday for shiv ji). Pray with full devotion and trust me you will be able to get over this problem. God will definitely bless you and help you, not just for this,but many other things as well.
In life whenever you cannot find a solution in the world, try to look within and pray to god. The answer is always there.
Also, try going to a doctor and talking about this issue. There is something called cognitive behavioral therapy which can help!