Getting a girl to like you is not always a simple task. Sometimes people's personalites simply do not mesh well together. You should look for a girl that you like overall and get to know her. Sometimes you will find that you are better suited for friendship and then you have gained a friend.
However, if you find that you have romantic feelings for her you might want to take the relationship to the next level. Be honest with her. Tell her how you feel and see if she feels the same way. If you want to pursue her consider bringing her flowers, taking her out to lunch or dinner, writing her a poem, or taking her to a movie. Always treat her nice and respectfully. If things are going well and she feels the same about you then you could eventually ask her to be your girlfriend.
