Hi, Teffytjs, and welcome to Psych Central! I am so sorry you didn't get any of those rewards, considering you wanted them so badly. Maybe the teachers didn't "reject" you as a person but had their reasons for picking other people. Who knows? Politics? Favoritism? Looking for other accomplishments than what you thought?
I also have trouble with rejection but am trying to learn to move on, although it's not easy. Maybe you can look for success in other places. Personal, private successes than mean a lot to you. A thought, anyway.
We care here. Many of us here have felt rejected for all sorts of reasons. You can be okay.