@scaredtodie94,
This is kind of a part of growing up, you start to understand the signals other people are giving off. And sometimes you misinterpret them, or your heart just leads you down this garden path and suddenly you have a crush on someone who was, essentially, just being normally nice to you and (in their eyes) not treating you in a particularly special manner.
You've gotta let it go. This is not always easy but, ultimately, it is what you must do.