How to get a girl to be your girlfriend

1.    Make sure she likes you. If she's sending you mixed signals, try spending a little more time with her until you feel confident about how she feels. Keep in mind that you'll have to be 100% sure; the point being made here is to not ask too early. If you're only just beginning to get to know her and you immediately ask her to be your girlfriend, she will say no because she doesn't know you well enough, and the resulting happiness might decrease your chances of being together. Furthermore, she will probably think you're a bit strange (in a, not so great way). One of the worst ways is to get to the "implied girlfriend" status. This is where you go out maybe once or twice, or take several times at least, the laugh, carry on, have a good time. Then, one day you sort of look at each other and ask "Hey, are we going out?". Invariably, the answer will be No. Most times, it is just worse not to ask, and to just let it happen.
2.    Plan better if you get uncomfortable and sometimes don't know what to do or say. Think of what you're going to say in response. Rehearse what you will say when you attempt to ask her out. If you plan on showing any affection, stick to hugs or holding hands early on. Don't come across as overly dramatic or too sensitive.
3.   Freshen your breath. Carry some mints in your pocket and take 1 or 2 BEFORE you talk to her. Don't say "hang on" and pop a mint in your mouth mid-conversation. She won't appreciate that. Your heart will probably be banging in your chest. This is normal. Relax. You'll be looking for the perfect moment, and it just might come. At some point you're just going to have to ask her out.
4.   Find a way to be alone with her. The closer in age you are, the easier this is going to be, but even if you have a little bit of privacy, when walking home from school or while dancing, it's better than asking her in front of all of your (or her) friends.
5.   Give her a compliment. "You look nice" is a short, simple statement showing that you appreciate the time she put in to her appearance. It is also a good conversational segue after hello. Be sure to smile and make eye contact. Don't overdo the compliments. That will make her you are kind of creepy and just plain like you less. And try not to make it too obvious that you like her.  Goodluck!!