Why would participating in a broken democratic system automatically imply you believe it isn't broken? It's all you can do to have even the tiniest amount of influence. Sure, your vote might not be worth much now, but that influence accumulates. It's literally the only thing you can do that has any impact at all, but you don't want to? Refusing to participate is not going to change anything, it's not going to fix the system.

As to your first point: "I don't vote, because not enough people vote for what I want" is a self-defeating argument. It's a dangerous argument, too, because it just reinforces the status quo even more. If you're unhappy with the current numbers, the very least you can do is make your tiny part of a percentage change.