i'm a enneagram 9 and my life has been a low-keyed perpetual depression without a definite source... @Rim that was a striking way of putting depression. i don't know why i'd never put it that way. it is too true. i am never openly angry to anyone except people closest to me. i.e. family, and even then it doesn't happen often because i don't like talking about my feelings, period.
this is not a good thing. my sister is really good at pissing me off and i remember two instances in my life that i literally went batshit crazy on her while we were arguing (which happens frequently) that i put her to tears and she said that she was scared of me. i wish i knew ways to show my feelings better so it doesn't rot inside.
with others i almost always only feel a mere annoyance because i never let them get that close to me to affect me so, and even in the rare instance when they actually do piss me off, i am reluctant to show displeasure directly and do it in a very detached manner when i do.
that people do not show anger/feelings does not always mean they are in control of themselves. these things have to go somewhere, and in my case it is all stacked up against me with nowhere to go except eat away from within. i have things to work out, i just wish i knew what and how.