The thing is, my job is underpaid. Many jobs are underpaid. Taking the opinion that you shouldn't care about others should mean that they don't care about mine, and nothing goes anywhere. I'm not under any impression that posting about it on a forum will change things, but it does certainly reveal the people who don't give a shit if it doesn't.
Look, all problems are relative. The biggest problem in your life being smaller than the biggest problem in someone else's doesn't make it less of a problem for you. Having someone tell you that, trivializes your life. When someone takes the stance people parrot here about 'bigger problems' when talking about your own problems, they're just telling you they think you're insignificant.