It is the duty of all citizens of a democracy to vote. Voting sets the course the country will follow. We need all our rational citizens to vote to keep our country on a rational course of action. Even if you don't like either candidate, one candidate will be better than the other. Your duty as a citizen is to vote for the lesser of two evils. And your vote counts.
I remember dragging youngest son to a school board meeting at which the vote was to pass a serious (big bucks) bond issue to construct a new building for the school youngest son had just graduated from. That bond issue passed by ONE vote. On the way home I told youngest son that I never wanted to hear him bitch that his vote would not count. It was his vote that got us a new school building.