Some of the different ways you can wear straight hair that's parted to the side include curling it to pony tails and braid it to the side. You can also try bows or the French braids. You can learn more by visiting: http://www.ehow.com/hair-styling/.
I also have straight hair parted to the side, I'm 13. My favorite way is to make a small braid or twist on the side of my head with more hair and then pin it back with a clip. This is really cute; I recommend it!