I think you pretty well nailed my view of contentedness with your paragraph starting "if you're lonely...". That's pretty much how I see it. It's a state of being okay, despite some needs not being met in the moment. Tend to urgent needs, be ok with some less urgent ones sitting for a bit, accept things you have no control over, and work towards bettering your position overall, instead of sitting and wallowing in the self-pity mire.