There are DOZENS of girls. And when you meet them, there are 4 options:
1. She doesn't like you. You don't like here. 2. She doesn't like you. You like her. 3. She likes you. You don't like her. 4. She likes you. You like her.
If you both like each other, it's so obvious. As I said before, there are dozens of girls.
So, instead of hopeless tries to approach the one beautiful girl and cry after the fail, it is more reliable to find another beautiful girl who will like you, because there are more chances for happy relations.
P.s. Math is good. Statistics are good too. Just meet more girls.