Some ideas.
First of all, good job on running your site all by yourself. Too few models do that these days, and it really adds that little bit of authenticity that keeps things interesting.
Second, the non-member portion of you site sucks. I know that sounds harsh, but it's true.
On the first two pages (warning page + main page) there isn't a single large, clear view of you, which allows an overall view of what you look like. How is that supposed to get people to want to join your site?
Compare it to this site:
http://www.tawneestone.com/
Do you see how that one immediately delivers a view of the model, and thus entices surfers to click through?
Then, on the "Picture Gallery" page, there are no full size preview pics. By this time, almost all surfers will have already decided that there is nothing to see on the site, will have no clue as to why to join (after all, they still don't know what you look like), and thus will click away.
The preview vids are nice, but most surfers will be gone by the time they could get to those.
Apart from those not exactly minor details, the design of your site is hopelessly outdated and rather bad. Gray isn't exactly the "hottest" colour out there, and it honestly does not look good when combined with pink. An "amateur" site looking amateur is good, but this design is not.
It would probably be a good idea for you to hire a professional designer to redesign your site. It will cost you some, but it should be worth it (if you get the right one, that is).
Third, like everyone else in this thread said, create an affiliate program. You being female will allow you to ruthlessly take advantage of half the webmasters on GFY.