Because "you" got a humanities degree and "it" is a tradesperson job which does not "make the world better". "You" chose to pursue "fun and interesting", and didn't run the numbers on "ROI", which only geeks, low-class people, and in-it-for-the-money people did.
* why doesn't it pay more?
Because experience counts a tremendous amount, far more than willingness to show up.
/me shrug
A lot of tradespeople jobs are done by immigrants willing to work many hours with low pay where natives are out looking for "rewarding" and "fulfilling" work. The Great Hand of Bettering Yourself By Hard Work will sort it out, more or less, more or less unevenly, in the end.
