It seems that you are worried,but don't worry about it,Everyone has some problems .You should get up early and then do some exercise,like running and jumping are really good for you.You should not eat junk food.Eat healthy food,you are only a junier hight school student.In one or two years,you'll be taller and stornger.At school try to talk to your classmates,Be brove and you'll find they are easy to get alony with,and you can also sak your teacher for help.I hope things will be better soon.