Sometimes I can't control myself...

I've always been an overly emotional person my entire life even as a child. Some people call it the redheaded temper. I don't like the word "No" and never have. When people say they're going to do something and last minute change their minds, I get mad and cry and act out like a 2 year old child. I can't help it. I've been this way my whole life. No, I wasn't spoiled as a child. I grew up poor, mostly... Not knowing whether I'd have running water or if I had to go to the neighbor to take a bath, kinda poor. Then my dad got a good job. I still wasn't spoiled though. I just don't know how to handle my emotions well, I guess. I'm almost 27 years old. Am I bipolar or something? I do see a psychiatrist and a counselor but I'm the type of person to not talk about things if they aren't happening in that moment. So they don't know the whole truth.