Self loathing and self harm.. is seeking help the right thing to do?

Seeking counciling and perhaps drug therapy should be a consideration. A talk therapist is the first place to go. The human mind is incredible as it can convince itself of anything. Yours has convinced itself of some things that are not in your best interest. Just as you can have a struggle with another so too can you have a struggle with yourself. You're going to need someone to help you with that. you can't fight yourself and win.