It is important to understand that many, many people have depression. If you ask for help you will be doing what millions of Americans do when they realize they are experiencing problems in their lives. Asking for help is a very wise decision.
A therapist is not going to think badly of you. Therapists are sympathetic to the fact that their clients are suffering. Their goal is to help the individual relieve their suffering. Most therapists are not judgmental. They want to help people. That is why they entered the helping profession. Therapists work in collaboration with their clients to help them solve their problems. This helps the client to feel that they are not alone.
It is very common for individuals to fear the unknown. Not knowing what to expect can be frightening. That may be why you fear attending treatment. Mental health treatment is nothing to fear. It can only help you. Depression generally does not go away on its own. It typically requires treatment. You have nothing to be ashamed of. Deciding to enter treatment is a sign of a wise individual.
I would advise you to speak to your parents. Tell them how you have been feeling and that you want to see a therapist. You may also want to consider asking them to attend at least one session with you. This might help them to understand what you are going through. It might also help to ease your fear. Here’s a link to a website where you can search for a therapist in your community. Please do not hesitate to ask for help. I wish you the best of luck.