Don't tell me your as good as the other guy. You have to be better!
Playing time and politics shows up in many ways...I'm sure you have a good story (so do I) and nobody cares.
Bottom line for every season is that you get better.
Sulking about the situation solidifies your coaches decision not to play you.
What are you going to do about it?
Use this time to develop skills (on your own) to prepare you for your future in baseball.
Take an (HONEST) inventory on areas you need to improve.
Get to work even though you don't get the reward of playing in games.
Bringing great effort with a positive attitude to the field will make you stronger in the end.
Prove them wrong with your response to adversity by working harder and getting better!