I'm 5'6 I'm 15 I didn't growth all the last year My dad is 6'0 and my mom 5'4 Why I'm not growing anymore All my friends are growing and me not?

You are 5'6 at 15 and didn't grow all the last year. your dad is 6'0 and mom is 5'4. If you are not growing anymore, you may change your diet, or since you are still young, there is a chance of growth.