How to cure severe depression?

Don't have no one to talk too about this since I have no friends. Been going through this since I was young due to being severely bullied. Tried medicine, but got off of it, because it made me feel like a zombie. My mind also goes blank when I talk to people, but it isn't my character. Just tired of it ruining my life. How can I change this?
How to cure severe depression?
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