Yes, I can certainly relate to this as I'm usually fairly placid but there are a few triggers that can cause a sudden flare up. Plus, if I get depressed, which I do at intervals all the demons that were safely tucked away rear their ugly heads again.
A hurt to the pride is one thing that will cause me to lose my temper but I think you have to have some pride or people will just exploit you. It's just that it can be a fine balance between having a healthy self esteem (hard for us due to the various rejections and hurts that come as part of being different from the norm) and having too much pride.
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Break out you Western girls,
Someday soon you're gonna rule the world.
Break out you Western girls,
Hold your heads up high.
"Western Girls" - Dragon