When things come to naught, they've come to nothing. If you feel bad about ending up with nothing, you can also say "It was all for naught!"
Have you ever put a lot of work into something and all you ended up with was nada, nil, nothing, zero, zilch, and zip? Then your efforts came to naught. Naught is a word for nothing that is used in specific ways, usually when a project or effort comes to naught.
