I work in an academic field and took a strong and useful interest in another field. I really don't think I overestimate my abilities, I say things like I a jack of all trades and 'x think I'm great at y and y think I'm great at x'. But still people think especially talented. I even see quiet disagreement from experts in x or y who are maybe not so keen to criticise me publicly. I feel the issue is that others over estimate my abilities. Maybe a case of conflating value (which is real) with ability?
It helps to think of your abilities on multiple axes -- sort of like a spider chart. Your expertise is actually the "area under the curve." You may very well be the foremost expert (comparatively) in certain regions of the spider chart. Ironically, building expertise in multiple domains actually helps you specialize relative to others.
>> I feel the issue is that others over estimate my abilities. Maybe a case of conflating value (which is real) with ability?
As much as people like to throw around the phrase "critical thinking", you're describing people being lazy and depending on their impression of you rather than evaluating the validity of what you have to say. It's a shortcut we all take because we dont have time (or ability) to be experts in everything so we listen to people we perceive to know what they're talking about.