Yep, been there man. It sucks.
She is not subtly sending you a hint. She is sending you a hint. She probably recognizes that you're in to her and thinks you're "creepy" or "weird" or (insert another term that just means she's not attracted).
Situations like these are where you need to play the long game. What I mean by that is that you need to keep working on yourself and improving to be a better person. Go out, find hobbies, pursue those hobbies, treat people well, stay fit, and be honest with yourself. You will develop into a confident and interesting person who isn't overbearing or egotistical. Stop focusing on girls; if you build it (yourself), they will come. This method may show results while you're in high school because girls may realize that you're cool and start to give you attention. This may show results in college. It may show results after college. But it'll happen.
The bright side that if she's doing this, she's not really that great of a person.