Hello lostintheworld123, welcome to Psych Central.

You are nearly 21 so you don't have to tell your parents if you don't want though it is good to have as much support as possible. It's not something you can just snap out of. It would be a good idea for you to speak to your doctor about how you feel. Also, there is usually a counseling service attached to the school, you are not the only one! I think it is great that you have recognised that you could do with some support, you'll find the forums here helpful too.