Your team is winning but you are not playing, how will you feel? what will be your approach in the situation? of course you are a little bit sad but you still should be happy because that is all you can do. Cheer for your teammates, be happy with them, never pull them down because it will not raise you up instead you will still remain in your position and you will not be able to change it. Negativity attracts negative things so all you can do is be happy at the moment. And even if you can't really be happy, just smile, never emit a bad energy. Just be hopeful that one day will be your time.
If someone gets promoted and you are not, but you are one of the strong candidates what will you do? Just be happy. Don't whine, don't complain and never say bad things to the one whose been promoted. Just feel happy and even if you can't be happy then just be quiet and don't say something. The decision has been made, it is final, there is nothing you can do about it. You can't change it, you can't reverse the results. All you can do is be happy. Fake a smile if you needed but don't ever get jealous or act like you've been victimized by your boss. There are some things that you can't control, all you can do is accept what is there.
Because being sad and acting like you've been treated unfairly will only make your situation worse. Force yourself to just be happy at the moment. Stay positive because someday will be your day. It is easier to change your situation if you will drop all the negative energy and start moving on.