I went through exactly what you're describing. Here is what helped me:
I used to drive to my low paying job listening to these lyrics (see below). KEEP FIGHTING and searching and asking for career advice, you will break through. But these lyrics offered me a lot of comfort back then:
"You don't need to make a million
Just be thankful to be workin'
If you're doing what you're able
And putting food there on the table
And providing for the family that you love
That's something to be proud of
And if all you ever really do is the best you can
Well, you did it man
That's something to be proud of
That's a life you can hang your hat on
That's a chin held high as the tears fall down
A gut sucked in, a chest stuck out
Like a small-town flag a-flyin'
Or a newborn baby cryin'
In the arms of the woman that you love
That's something to be proud of
That's something to be proud of
Yeah, that's something to be proud of"