I am also bad with this myself, but a little different I think.
Usually I'll do whatever I can to avoid a situation becoming worse or an argument developing. The times I've try telling the other person/people I'm unhappy, I'll spend a little time in my head beforehand working on what I want to say, all structured in a logical order, so it makes sense in my head and expressed in a way not likely to get them offended, most of the time not having any luck there. I've had so many backlashes my many different people, most of the time I end up retreating from the situation or isolating to get away from them.