@cowboyjim99x assuming that someone else is using your account, I suggest changing your PASSWORD only. Changing your account ID would result in losing your future credits for anything you previously uploaded, and if someone is accessing your account, they would still be able to access your account because the password is used to access your account, not the user id.
Maybe I misunderstood something, but my point is that the first thing you should do is change your password. See if that solves the problem, and if not, then try other solutions.