Not sure what you would call it but i dont mask my reactions very well. If I'm disgusted it shows on my face, if I'm angry it shows, if im happy it shows. The only thing I can do to conceal my emotion is to hold a neutral face which is interpreted as disinterest or boredom.

It's good because I don't have to try hide anything I just do what I do and go through life answering any questions people have. But it's bad when I know I shouldn't react in a way and everyone can tell my reaction. Example someone died in my workplace and everyone was looking sad but I was smiling because I didn't know the guy and we were getting half a day off work paid. Or my girlfriend was overly upset about something I thought was trivial and she said I look like I don't care and I said yes I don't care.

The amount of times I've been in a serious conversation and had someone ask me "what's funny about that" and I have to tell myself don't answer that.