I can't stop feeling demotivated and empty at work

Hi everyone. I work for a small consulting company with a flat hierarchy and lately have been having a hard time finding meaning in my work. I has been pretty demotivating to see other people who joined several rounds after me get promoted while I'm still in the same position. While I recognize that they're being promoted on merit, I'm human, so it still doesn't feel very good, especially when I work really hard and spend time outside of work on professional development. I know that I need to make more progress in certain areas to be considered for a higher position - that's on me, but the company has also not been making an effort to give me interesting projects. I worked on repetitive tasks for at least half a year, for example, before my sueprvisor noticed the imbalance. How do I change my mentality or perspective? I want to stop feeling miserable at work. I'm both upset with myself for not being able to achieve more, more quickly and with the company for not supporting my professional development? Does this make me a petty person?? I have started looking for other positions, but in the meantime, I want to at least be able to control the negative emotions that I keep bottled up inside of me. Thank you for allowing this rant.

I don't think you are a petty person at all. I think your thoughts and feelings make sense. There is a lot of unfairness in the world. I sure hope you find a way to advance or find a position that is right for you!