Personally, it depends on the situation and external factors involved. I have no problem verbalizing my feelings when need be, but it's a rare occurrence. I try to suppress my emotions and thoughts to maintain some sort of peace. I don't like any type of interaction or conversation that could potentially stir any awkward or negative feelings, thus I keep my own feelings private and analyze and resolve them on my own. But when I was going through my stages of depression in my younger years, I knew that I couldn't rely fully on myself to get better. So I believe we INFJs know a certain point and time when we really can't afford to be stubborn and have to seek others out and gain some perspectives for mental well-being and clarity; otherwise we would get stuck in this painful NiTi loop.
Nowadays in some rare occurances, if I do get into situations or circumstances where I am overwhelmed and strongly cannot contain my emotions/ thoughts that have been quite nagging, then I will speak up---I won't enjoy it though. I notice the tendency that some---not all---INFJs keep certain emotions to themselves to the point where they cannot contain them and it blows up at one point; an aspect that needs to be worked on and something I am quite guilty of at times.
Nonetheless, I believe I fall more in the spectrum of downsizing my emotions not because I am fearful but rather because I am private and prefer to fix my issues alone just to maintain the peace.