I am 63 years old and I could give a %^$% about what people think. I know some of you are young but realize that if someone thinks bad of you, they are just using that as a weapon. For some reason they see you as a threat to their own little world of lies. When you go out into the world try to make a good impression on your boss, people you care about and so forth. If they still think badly about you say in your mind that they can go to hell.
Each of us is responsible for our own happiness even though there are many who think not. There are many who want to bring you down to their level of unhappiness. The best way to combat all of them is to smile, to be happy (even if you have to pretend at first) and to ignore them if they don't change their ways.