I'm going to repeat a grade again?

Don't end your life because of bad grades. Find a public charter school near you that's for kids at risk of dropping out and take summer classes there online or something. The work is usually much easier than regular schools. If you do drop out, try to get a GED. If that doesn't work out, you find a decent job to support yourself in the future. Working for years at a fast food joint with a good attitude and showing good leadership skills can move you up to a manager or something.