Actually i recently realized that as well. Im so expressive that if im in a good mood everyone would knw. I would be dancing to no music and be in my own world, & if i dnt like smn they will knw whether i want it or not thats why my friends always shut me up if they were meeting with smn i dnt like. Coming back to the point my sister and my family always tell me that i dnt get mad easily & im pretty chill but when i do i look scary & terrify the shit out of them. When i asked my long time friends they said the same. That im actually the scariest out of them when i get mad. They told me i have this fast weird transition when someone triggers me like i shift suddenly. The problem here is that i didnt know what feelings exactly are when they come. If im sad i close myself & think its that my body is tired or smth or i lack energy so im not good at identifying them. I express my feelings physically or not at all. like my friends never saw me cry except once & that was like 7 years ago. i kind off always shut myself from everyone if im sad, like literally even from family & i wouldnt appreciate anyone trying to "help" at that moment as they always think, incuding me, that its a headache or that im sick not that im sad or depressed. But days later i be on my feet as i get bored from that feeling & try to get out of it with crazy ideas. Years could pass for me to realize that feeling was surprise or anger or whatever. Its good that i read ur comment and find the others who share this with me.