Things we take for granted, that couldn't be bought with money: a lot, i.e. health, family, friends, job, opportunities...
When we lose them we would break down and cry, regretting it as if we lose our dear life itself.
Yet as a human, having an exceptional adaptive ability we continue doing this. Once we've achieved what we've aimed for (having a girlfriend, having a job, etc.) which is better than our previous, we quickly adapt the new status quo as our new minimum standard and become dissatisfied, aiming for more.
When you're feeling discontented and nothing in life seems right or going according to plan, take a moment and look around: you have so many things (non-material) to be grateful for that keeps you going in life.
Or, if you still can't feel better, look down and realize how lucky you are.