If you could change anyting about yourself,what would it be why?why is it important?

If i change anything about me i can change my body structure and  made like a tonyja.it will be good to me because he had a body like a rubber so he can do every action he like so i will be like him.Its significant because if i have a body like tonnyjaa so i will fight with everyperson who is stupid and who always harms other people i can kill that type of person so other people may spend a peacefull momment.