It could be that you have nothing to offer — no skills, no talent, no prospects, and all of the doubts you harbor about yourself are pretty much true.
Or it could be that the world has deep needs that you are uniquely qualified to address. It could be that you were put on this earth to be the exact right key for a specific lock of change that will remain tightly shut without your part. It could be that you are the precise bit of effort needed to push the needle of change on the human condition a bit more towards justice, equality, and happiness.
Which is it?