You have a right and duty to vote your conscience. Don’t be scared into voting for someone because you’re afraid of what the other candidate might do. Don’t protest a deaf establishment by voting for a demagogue.
We don’t vote because we genuinely believe we can change the outcome of elections. That’s foolish. We vote because we have a civic duty to do so and because democracy wouldn’t work if we didn’t. So, since your vote doesn’t matter anyway, vote your conscience!