I want to travel without my parents.

You never say goodbye, they will still not understand you, so be patient, choose a good time to communicate with your parents, find a good starting point, or use teachers to communicate with your parents, or borrow others' words. Depression is nothing to be afraid of, or you can find a reliable hospital in private to check your situation. If you have depression, you should respect the doctor's advice. After all, it will affect your life. If you are diagnosed, you may be able to communicate better with your parents with the diagnosis certificate. If not, don't worry. Maybe it's just pressure. Find your own pressure point and try to solve it.