If she doesn't like you, there isn't anything you can do about it. Move on, meet some more girls. You will get over this. Be honest, respectful, caring, and willing to talk about anything. and SMILE. You can meet and talk with anyone. But, If they don't care for you, then meet someone who does! Good luck.
She rejected you. Respect her. If you love her that shouldn't be hard to do. If you just keep pushing you look like a stalker. Move on with dignity. You are 14 and there will be a few more loves in your life so start looking for the nest one.
I'd say try but don't over do it. I let down a guy in 7th grade and my friends thought it was sweat how he wanted me. So they told him where I lived and how my parents work late. So it was after school and my sister was at a friends house. As I was walking home he was waiting at my front door. It scared the crap out of me!!! So it's important you respect her choice. Because you love her. It creepy when you go all out I love you on her. Trust me.
Love knows no age. Listen, if you're in love, your in love. There is noting you can do but let this girl know point blank how you feel. Girls like guys who just come out and tell them how they feel, just asking some one out doesn't show a girl that you love her. Tell her exactly how you feel and if she rejects you again then I'm really sorry but I don't think there is anything you can do but let her know that you like her and hope that she changes her mind, I think that eventually she will realize that she does want you. :) I hope that helped.
Dont give up. If you really truly love her then dont give up. Just remember to listen to your heart and give it some time who knows maybe she will end up liking you. Just dont give up and always follow your dreams. Good Luck :) <3