All Teenagers hate themselves. Its part of growing up, puberty and chaos of hormones in your biological body. Relax. Dont think you are alone. A million others are exactly in same mindframe. Visit a good Psychologist, have an open discussion about your life's strengths, weakness, opportunities, threats, etc. Talking sometimes solves more problems than doing. So come talk to a psychologist instead of panicking about how to deal with Real Life

Hi dear. Your age is very small. Why you have such a idea ? You may be sad for few reasons. I will agree. Anything could have happened which made u depressed. But thinking to die is not a right method. If u have counselling done in school go to teacher and talk about Ur issues. Or tell Ur parents. If friends dont talk to u properly convey to any family member. Thing will be alright soon. Dont worry. Cheer up. Think positively. Dont think to suicide.