Surround yourself with happy people. It is easy to begin thinking negatively when you are surrounded by people who think that way. Conversely, if you are around people who are happy, their emotional state will be infectious.
I love Beyonce. I first fell in love with her in eighth grade, when I went to see her perform at a Destiny's Child concert. She sang "Ave Maria" acapella, and it was amazing. Beyonce is a classy, fabulous, and smart business woman. Plus she's married to Jay-Z. Check out this vid that shows just how badass Beyonce is...