I have a friend who is so completely unlike me, I can’t figure her out.

My friend, J, dislikes anything that brings her out of her regular physical and mental condition. 

She doesn’t drink or do drugs or eat anything spicy, foreign or too complicated.

She doesn’t do any activity that might make her heart rate go up, as she finds this alarming, nor anything that results in any kind of muscle feeling.

She does not show considerable emotion, rarely raises her voice or adds any emphasis to stories.

Could this just be a very VeRY small comfort zone? Or is this a symptom of a condition?