Feeling useless and lost
What a wonderful feeling is uselessness. It strips us of the last bit of decency we have for ourselves. It speaks to the highest form of ourselves - consciousness - the thing which tells us we do something right or wrong. When we feel useless, we know we ought to do more, we need to try harder, and we need to find meaning in our lives.
Working in a dead-end job? Working just for money with no positive effect on others? Not working at all? Blindly going from job to job, from hobby to hobby, from inspiration to inspiration. And in the end...there's nothing worth a f*ck around you. It's funny how we know we should do more meaningful things, yet get stuck in comfort. It's funny how feeling useless is accompanied by its best friend - feeling lost.
"Pick the heaviest load you can carry" is Peterson's advice, and I think it is a good one. He says meaning is found in responsibility, but you can be responsible for a whole marketing department for washing machines, and I don't think you will find much meaning there.
Help people. That's my advice for feeling useless. You might still feel useless even when you help thousands or millions, but that's the nice thing about feelings...reality doesn't care how you feel, it cares what you do.