If you're like me then you realize that no matter who you vote for this election, you won't be represented on most major policy decisions. Sure there will be some trivial things like, you know, staving the complete collapse of US society as we know it off by stopping the Republican candidate. But then you know, a competent government can do bad things much better than an incompetent one. So it's hard to say.
In any case, your vote not counting is no reason to not vote. It just happens to be things are bad enough your vote might not be enough to make your vote count so you've got a bunch of other shit to also do to make sure your vote counts next time.
Some Friedersdorfian reasons you might not want to vote for either candidate: