Oh, I understand what you're saying. I reckon your friend is right about it having something to do with your aura.
One theory:
Your aura may be picking up on these entities/people under stress that it does not feel are positive and is trying to signal to you through unease and hot ears, which could be part of a fight/flight response. Everyone feels fight/flight different in detail. Or you are taking their stress into your aura, which manifests as radiation energy.
Another theory:
You are probably a type of empath I suspect. And you may have an energetic opening near your ears, which allows peoples energy fields to enter, especially the ones that are under stress and you experience this as heat.
https://www.annasayce.com/overactive...-ruining-life/
https://www.annasayce.com/how-turn-o...ctive-empathy/