I've read just enough feminist writing to know that I can't actually understand at least 50% of the stuff, because it's at a level and in a jargon that I can't read. A lot of it is... um... not very concrete.

But I'm pretty sure you don't have to understand all of feminism to identify as a feminist. It's such a fractitious field that the word itself barely tells people anything about your beliefs anyway; the term's been used so many ways that when you use it for yourself you can pretty much self-define what it means to you.