Oh man, this is a mess.

You don't care enough to register... twice. Yet, you care enough and know enough to say with certainty that neither mainstream candidate deserves your support? That's odd in itself. Better, your concern with Trump is that you didn't like his book? There are many better reasons to be concerned.

Honestly, it's probably best if you don't vote. You wrote an entire political post without once referring to an issue or position. It's clear that you have little interest in politics, only interest in telling us how bad everything is. You might not be wrong, but that's not a reason to go exercising your political rights without thinking about it first.

To answer your question: no, this is not the year a third party gets in. The third parties have neither the funds nor the organization to seriously compete. The best they can do is draw votes from one of the two main party candidates, like Perot drew support from Bush Sr. in 1992. If you want a Clinton presidency by all means support Johnson. If you want a Trump presidency by all means support Stein.