How to flirt with an introverted girl?

I'm 14... she's 16... she's going to college soon while im at 2nd year high school, anyways what matters is, i dont know if she has interest in me or not, I think she likes me, but when I talk to her, I feel like she doesn't , but I'm not really sure since this is the first time I've met such a girl, she told me she doesn't like approaching others first because they might think she's "feeling close" so I'm always the one who approaches her. She doesn't reply to my messages much since she's busy studying, and I know that it's the right thing to do, but I'm seriously confused, do i have a chance on her or not, I'm kinda introverted myself too but I'm trying to change, so can anyone help me on this case?
Do you guys think I have a chance or not? What should I do to make her like me too?
I've had lots of girlfriends before but none of them was like her, and I think I'm really inlove with this girl. I don't wanna let her go no matter what but I don't think she feels the same way.. what do you think I should do? I feel like I'm being too clingy... any tips on that?

Thanks guys really appreciate your help :)
How to flirt with an introverted girl?
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