How Can I Change My Hairstyle ?

Ok so i just asked this question but i didnt get the answers i want. This is basically how my hair looks.. http://www.thehairstyler.com/hairstyles/formal/medium/straight/rihanna-8446?ref=celebrities .. just its not so short or bobbed. and to tell the truth i basically look just like her we have similiar features just so you have an idea, but i wanna know how i could style my hair for school besides wearing it straight done .

Suggestion:

Shave it all off and paint a smiley face on your head.