TODDLERS!! AARRGGHHH!

Ok so i am sitting here on only a couple hours (if that) of sleep over the past two nights because Ryann insists on having an emotional breakdown either right before bed, or during the middle of the night. I am supposed to be enjoying my sleep because once we hit october, i will have a new baby to keep me up all night. I just can't figure out if she is incredibly stubborn , I am parenting wrong, or something is bothering or hurting her. It just doesn't seem like the rest of my friends have such a loud, crying, screaming kid who never goes to sleep at anyones house, or has emotional breakdowns at the drop of a hat. Literally, she will scream and cry her head off, throw things, including her body, and go completely insane if she doesn't want to do something. My neighbors probably think I'm a horrible mother, along with everyone at WalMart. That seems to be her favorite place to throw a fit in the cart. All I can really do is ignore her, because I for sure won't give her what she wants when she is acting like that, but people really look at me like I'm crazy and they have never seen a 2-year-old act like that before. AArrrrghh.....I am at a loss here....