Have the same problem. Did a law degree at a top university and have tons of experience.
Ultimately, I don't think it's what I want to do, but I feel trapped in a way. Looking into other careers, with a 2017 start, but feel like I've wasted the last three years.
You're being quite melodramatic regarding 'essentially ruining your life' it's not a surprise that you haven't secured one, when the cycle has ended. Grad recruitment will start again in September, so just start researching now. By late 2016/early 2017, you could have a grad job, leaving you time to enjoy yourself.
You need to decide if you actually want to study the masters.