you don't have to be someone else to be good, because you are already good the way you are. often times, you are afraid you are not good enough and this fear lead you to conceal who you truely are, but you have to be yourself to be good.
evil do exist in this world, but you do not have to be afraid of it, because when you are who you truely are and shine, evil goes away by the light you emitted, and will never return.