Hi Hen,
First, She Cat makes an excellent (and probably the most important) point.
Your post not only makes a lot of sense, I find your question a very important one. So please hang in there while I ramble on.
When I discovered alcohol in my teens, I always wanted to fight when I reached a certain threshold (or blacked out and was awakened), and I was always angry and ready to fight (didn't know exactly why). And anger was the scariest emotion for me for various reasons, but it's too long to explain why in this post.
And when I think back, each time I read books on emotions, my reaction to the "anger" chapter was "ah, I never get mad. I'm easy going. etc." And now, some 20 years later, I've discovered that anger was the major theme in my life - or more specifically, extremely inhibited anger - which is a symptom of Complex-PTSD.
Today, I'm happy to say that the work I did to understand, express constructively, etc my anger, and reasons for it, paid off.
In my case, I felt more psychologically terrorized than anything else. Thanks to using a cognitive based approach, and years of journaling and much therapy, what I eventually discovered was that my thoughts, and associated feelings, were going so fast in my head (much anxiety), I didn't even know they were going at high speed until I was able to calm my mind.
Displaying emotions was almost unbearable to me because I was so self-programmed to act if everything was ok and nothign bothered me. And because the thoughts and feelings were going at high speed, I had no clue what exactly I was feeling or why. It was too jumbled up. Plus, I had also repressed all the negative emotions, and some good ones, so I felt numb a lot.
So in answer to your question on managing emotions, I have no idea how I managed mine for the first 30 years because it was too confusing.
But when I learned to examine and question my beliefs and negative thoughts and get rid of the distorted or untruthful ones, it got easier to manage the emotions.
One thing that helped me too was I made a list (you can search the internet) of all possible emotions, and identified which ones I felt, which ones I didn't, which ones I wasn't sure of.
LAstly, I was told by a shrink once that I should channel my anger in constructive ways. An excellent way to do so is martial arts, kickboxing, punching bag/pillow, any strenuous form of exercise, chopping wood, weight lifting, construction work, drama role playing in a safe environment, screaming out loud somewhere safe and private, is good to release some steam, clear the mind some, until you can get back to questioning negative thoughts and beliefs, and dealing with every day problems as best as we can.
Hope this helps some.