Although it is seemingly impossible to change what others think of you because you can not control what they think of you but you can at least be of good attitude to those around you. By doing so, you free yourself of the thought of how others perceive you. Once you know within yourself that you are a good person, you can go about your daily activities without having qualms about the impression your fellow man have about you.
Moreover, there is a popular say that how others see you is your reputation, but how you see yourself is your character. There's absolutely nothing you can do about how people see you because whether you are a good or bad person people must talk about you. Advisably, don't wear yourself out by worrying how others see you but significantly, always be of good behavior to those around you.