Well, that is a good question...
I never felt safe to feel any feeling, as my reality and the sense of self (including my capacity to feel) were compromised when I was very little. I could not rely on my perception of reality, due to gaslighting, and I was very cautious not to show my real emotions in any situation, as they were constantly used against me, to manipulate me. The safest way not to show them was to actually anesthetize myself regarding emotions, so that I would just not feel them.
The result of this survival-oriented emotional self-mutilation is my inability to feel the emotion at the moment it is "happening" in my body, as I always have a delayed perception of an emotion, which can be measured in minutes, days, months, or it may never happen at all. So, basically everything is first stored in my body, and only afterwards, if I am lucky, released as an emotion.
The other problem that I have is to actually articulate the emotion verbally. I just know that my emotions are very strong, but I often don't know what they are, or even to which spectrum they belong (happy, sad, angry....) - I don't think that I am completely illiterate in emotions, but there is some kind of denial going on about their nature and quality.
I had a complete auto-censorship regarding emotions of anger, rage, hatred and hurt...until I placed the responsibility for my hurt and anger where it belongs. Now I feel I can tolerate these feelings a bit better, and even express them (rarely), but I still have a long way to go.
What I still cannot tolerate is the feeling of grief over loss, as it throws me right into suicidal thoughts spiral. However, loss is something every person has to face in a lifetime, and when I think that the feelings of anger, rage and hatred used to throw me on the same suicidal ideation path before, I would say that I am improving.
Many times, since I am no longer DPd, I wished for DP to come back, as I could not cope with what I feel. Still, that is just another panicky way of my mind to try to get some (temporary) relief. When I was little, I heard a story about the river vortex, saying that you cannot fight it once it gets you, but can only let yourself being sucked in, in order to get out of it. Every time I think about the emotions that I cannot bear, I imagine being sucked in, letting go, and hoping to get catapulted to the other side unharmed.