How to get a girl to like you?

Now these types of questions are really complicated to answer. I mean, not all girls are the same, right? Plus, I am 14. I might not have the same opinions as a 12 year old girl or a 10 year old boy. Still, I will try my best!
So you do mean that you confessed to HER right?
Now there are two possible reasons for her ignorance.
One- embarrassment. Two- awkwardness.
She could be embarrassed with your feelings and may be debating about whether she likes you or not. She could be feeling really awkward. I mean, maybe she never really thought any farther than being friends.
From here, it's going to be a bet. Like I said, I am not her, so it may be different.
Approaching her:
Some people (usually talkative, funny, "modern" people) tends to like the boy approaching her casually with a hi or a wave. Just small conversations here and there. The sense of touch is also really important. Now, don't just go wild over her body. Just a casual tap on the shoulder or something.
Listen to her stories. Catch every detail in her speech and compliment her when she talks positively about herself. Base your sweet talk with her heart, not her looks.
Start the conversation yourself. If she's ignoring you, go to her yourself. We girls are really bad at getting to the point ourselves. Guide her into telling you why she ignores you.
Try confessing more than once. This shows how much you like/care about her. Make her laugh. Someone whose entertaining can win someone 's heart.
Talk evenly about yourself and her. Tell her why you like her.
Notice things about her and point them out. Of course not negatively but positively. Don't overwhelm her with you. Sometimes, give her space.
Confession is also a point. Some people likes to have words like love in it. Others tend to just enjoy the plain old will you go out with me. I tend to want someone to say "I like you" because it feels more like they actually do.
HOPE ALL GOES WELL!!!