Constantly getting angry quick?

Your just 15? That explains it all. You are still growing and your body is changing daily. Your hormones are fluctuating and that alone can make you feel angry. You are also at a age where you want to be treated like adult, but your parents are not ready to treat you like one- yet. Don't worry they will- especially after you get out on your own and start paying your own way. Untill then... you may get disrespected because your still a minor. Don't worry - it will get better as you get older! Just try not do anything you will regret. Like quit school. Finishing your education is the key to a future of being free and on your own where you wont have to live with people anymore that make you angry.