It is not my experience that we are here to fix the world, that we are here to change anything at all. I think we are here so the world can change us. And if part of that change is that the suffering of the world moves us compassion, to awareness, to sympathy, to love, that is a very good thing.
Think you can't change the world? Too late, you already have. It was changed for the better the minute you were born. There are more people than you can imagine who will never be the same because they came in contact with you, if only for a fleeting moment.
I don't want to speak too disparagingly of my generation (actually I do, we had a chance to change the world and opted for the Home Shopping Network instead), but there was a view among the student writers I knew at that time that good writing came spontaneously, in an uprush of feeling that had to be caught at once; when you were building that all-important stairway to heaven, you couldn't just stand around with your hammer in your hand.