You definitely should go in for therapy. Suicide is never, ever the answer and licensed psychologists can help you overcome these thoughts.

But as I have told u I'm scared to tell my parents

But as I have told u I'm scared to tell my parents

I understand that feeling, but getting help and support to overcome negative thoughts is far more important than however your parents might react. It's important to not allow fear to stop you from doing what needs to be done to get yourself help to overcome negative thoughts.