I had a similar issue a couple years ago, and the best thing I ever did was get professional counseling. I went to my school counselor to refer me to someone (they usually know the good ones in your community) who could help.

This person helped me work through my thoughts and gave me coping strategies. Again, it was one of the best things I could have done to help the situation.

My counselor was a faith-based counselor, so if you're a believer, I HIGHLY encourage you to seek out someone like that.

I wish you the best.