you have the potential to be anything you want, its all up to you!
they are only trying to make you feel bad about yourself because they can see the potential you have, the potential to be a better person than they will ever be.
do not give them any attention because immediately when you start trying to fight back, that will be you sinking down to their level.
learn to let go of negative influences, do not give anything that does not make you smile any power over you.
its a personal choice, it all has to start with you.
believe that your worth it, it will definately be worth it at the end!!!