It is wise, I think, to put forth effort only in things that are useful, in the sense that it can help another person. That means, though, nothing worthwhile is being done. Well, nothing can be done about the fact that nothing worthwhile is being done because knowing that doesn’t change a damn thing.
Whether to continue or not is not a moral question, it is a psychological decision, to be taken solely by yourself. Because the choice you choose, you have to live with it, for as long as you wish to live with it. If you tell someone about your choice, then you have to live with it for longer, probably.
Nonetheless, it is important to follow your heart, not just because it pumps blood, but mostly because it pumps hope into the hopeless life we all live.