I'm such an idiot

I'm a freshmen in high school and I failed algebra first semester and I'm about to fail again. Ever since elementary I have done absolutely terrible in math. No matter how many times its explained, how much I study, I never understand anything at all. I still count on my fingers on every problem I do. I fail all my quizzes and tests. I get answers terribly wrong on the board in front of the entire class. I've been told by multiple people I'm a idiot because I fail to do basic math. I don't know why I can't do math at all. I've considered suicide because I'm such a useless waste of space that wastes my teachers time and my parents money because I'm so stupid.