They think I look too young

“They think I look too young.”

This is my thought. I’m 31 and a coach. People have long thought I’m 19-22 years old, and not in my thirties. It sounds like it would be great, but I feel like it’s holding me back. I think people will think I’m too young to be useful/helpful/experienced, so they won’t work with me. I know it’s my THOUGHT holding me back, and my own fear that “I look too young”, I just can’t seem to get away from it. I can’t seem to make it not true. And with every person who thinks I’m young and tells me just fuels the fire.

What can I do to help myself here? I see the thought, but it feels so true. I can’t seem to get away from it.