I am only talking about the effects of your ballot ultimately helped trump to win, since he had now one vote less to win against.

Of course, I understand, that you would have to vote against your interests, if you voted blue.

Next time, make sure that more people in America know the third-parties, write to people, talk to people, organise rallys, make ads, etc.

Then your ballot is not worth nothing if you vote third-party, because then other know that their vote is joined with others and gains momentum.