There are times when in Everyday happenings

There are certain times when I feel like exploding out and becoming bitter about everything, there are times when I get angry at myself for being like this, this tangled bundle of emotions and nerves. I get angry when someone hurts me and sometimes that anger come out as tears from my eyes, which makes me more frustrated. I hate the anger that stems form my mind when I become irrationally emotional, I am not someone who shows her emotions a lot, so all that I feel I feel it inside my head, in my mind. My mind could be wrecking havoc, but I would smile a little and nod my head on the outside, in front of others. Sometimes the people around me are the reason why I feel conflicted or triggered, but what am I supposed to about it? They are not aware about what makes me trigger since I am not too sure myself, it’s always a subtle gesture or action, or their choice of words, or their careless attitude towards important aspects or their behavior in general, I don’t know. All I know is that once I get triggered, I internally fight a battle, I implode and during that time I constantly control myself to not say or do anything irrational, I have to make sure that I get these emotions in control before I breakdown. That is the most annoying part, when I collapse into tears because of frustration.
When I end up crying, I get angry over myself as to why am I like this?