The reality is that nearly all people of European descent have "nobility" in their heritage. (In fact, more than 80% of people living in England today descend from royalty.) It's a simple matter of mathematics -- just going back 10 generations, you have up to 1024 grandparents (assuming no one repeats, which is rare). So descending from nobility/royalty is to be completely expected for most users of this website, and not at all uncommon. Here's a nice, brief essay explaining how this works: http://www.elvidge.com/Genealogy/essay1.htm
The only way you're going to find anything is to continue tracing back as far as you can in each line; there's no simpler way to do it. If you're like most of us, you'll eventually hit on something. But I wouldn't fixate on it -- unfortunately, distant noble roots aren't going to get you much in life today. :)
