So here's a common sense question:
Bertha, it's clear that no one really believes that picture isn't a picture of you. Although I've asked you once or twice for a real image over the years, basically at this point I'm just giving you the benefit of the doubt when you say it's not. People stopped bugging you about it years ago because they just stopped caring. As far as most of us are concerned, the mystery was solved once your image was finally posted all those years ago. Even if that's not you, that's the face that goes with the name for now.
Since most of us have had what we think is an image of you for years and nothing bad has ever come of it, if that's REALLY not you......why don't you just end the whole mistaken identity thing and post a real picture?
Say hi to all these people you've been talking to for half a decade as a real person instead of a cartoon character.