One of the hardest things for most people to accept is that they don't control everything when it comes to their career. You could be the best, most-deserving person and when it comes time to hand out a promotion, you may not get it.
Sometimes that's because companies value seniority over everything else. In other cases, the person in charge has a different view and, in some cases, things are just unfair.
Don't worry about those things. Focus on what you can do to earn a promotion and, if one does not come, you'll be better positioned to find one elsewhere.
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