Frankly I have seen these sort of comments for over 30 years and usually it is due to the person you see in the mirror every morning, even though you seek to blame everyone else (colleagues, managers, the company, the system, family, friends etc etc) for your own lack of success, stress levels of feeling of worth or the fact everyone else seems to have it easy and you are the hardest working person in the company.
Until you realise that you decide how your career progresses and if you are in a company where you feel it is completely broken and will never let you get to where you want to get, that does happen, YOU can change it. Own your career and stop looking at others for why you are down trodden. We have all had crap jobs, we have all worked for poor managers and have felt undervalued at sometime, that is business, but you can change it, you do realise that?