Is it transferable? Assuming you can resell it to someone else, I would think that's the most straightforward way out. You could always try craigslist or similar sites. I assume there are sites dedicated to timeshare swapping/selling, but I don't know if those are shady. I think you are already approaching this from the right frame of mind: focusing on the ongoing costs from this point forward, don't fret about the past. Personally, I wouldn't concern yourself with taking a "loss" on getting rid of your timeshare since it sounds like you're not going to be able to use it enough. It had no resale value when you bought it. Sell it for what you can (if anything), and get yourself out from the ongoing maintenance fees. Not to be a downer, but from I've heard in similar situations, you likely will need to literally give it away for free to get rid of it, since it comes with ongoing maintenance fees.
If you have absolutely no luck selling it or giving it away for free, then you might need to play hardball with the timeshare management firm. I have no guidance to offer there, you'll need to do further research if you reach that point. I don't know the repercussions (if any) on walking away/defaulting, but my guess is it would be comparable to not paying a bill to any creditor like a retail store. You'll get lots of annoying phone calls and letters, and will get a ding on your credit.