Been legible to vote for 35 years and always have, but also believe in a persons right not to vote should they so choose. That said, having not voted reduces a persons credibility considerably when it comes to complaining about the outcome.
I used to feel exactly the same way, but I don't anymore. When a system completely fails (which our 'participatory' democracies have) it is perfectly acceptable to refuse to participate in it. Instead its more worthwhile to look outside it, and argue for something to replace it. Lets be honest, if the number of people voting falls dramatically it becomes very difficult for any government to claim a mandate. In that situation a real change from outside is a damn sight more likely.