Be yourself, be friendly, be seen as in get involved in school and extracurricular activities, be friends with guys helps you to be able to talk to guys on a social level, change your style gets you noticed right away, don't appear hard to get or easy..
If you are asking this question, then you probably shouldn't get one for now. And it is not because of the age cathegory, but because you don't need a boyfriend. You only need a boyfriend if you have fallen for someone. Made myself clear?
The concept of having a boyfriend just to have one is rather pointless...
Be conceited, and sit near guys, but not so close it's creepy when you're out somewhere. Also spazz out in your motions; constantly flip your hair or check your nails to draw in a guy's attention. Why not, right?