Depressed-Help!

Im 13 and my parents are devorced, I live in Wisconsin with my dad, and my mom lives in Colorado. I have been having issues with homework and almost everything related to school work. I think im depressed because I dont want to do any of my favorite things, dont want to get out of bed but most importantly i self harm. Since i think im depressed i want to tell my dad...... But i dont know how, help!