Sometimes we think limiting beliefs have to be big and complicated. But usually they're simple (and quite standard -- common). I'm surprised no one has suggested the Belief paraliminal to you. I'm working on this area of my life a lot right now, so I'd love to help you if I can -- if this is something you're still working at.
I discovered that when I just sat and identified a first thought (finding the beginning of the piece of string, if you will), I was able to go underneath that first belief "I make bad decisions" to why I believe that -- what do I belive about making bad decisions. Bad decisions means mistakes. Mistakes mean wasted time or I'm doing life wrong or I'm a disappointment. When I identified that first belief, the underlying beliefs began to flow. And the key is to get to a root limiting belief rather than one of the upper beliefs -- the branches on the tree rather than down in the roots. From there, installing an empowering belief is an easy next step.