I've only just now gotten around to perusing this thread.
I don't think I ever had a problem with support when it came to motorcycles. I mean, I've pretty much always done whatever I felt the need to delve into but when it comes to bikes, I've been pretty lucky. My dad and best friend were both present when I bought my first bike. They were also present when I crashed and almost died. And through all of it they didn't even think twice about remaining steadfast in their support because they know it's what I love.
Of course, not everyone thinks the same way. I've had people come up to me in fast food restaurants and inform me of how dangerous bikes are. I had a guy actually pointing his finger in my face and yelling at me because "You're going to get yourself killed. Women have no business on sportbikes." It is what it is.
It sucks that your boyfriend can't respect you, your aspirations, or your limits when it comes to motorcycles. Sounds like he has some growing to do. As for you, you will find a lot of positive encouragement at the track. There are a lot of people out there who are out there because they legitimately want to learn how to be more proficient riders and they tend to be very supportive of each other. The best part about it, is by doing track days you will end up progressing so much faster than you would learning my trial and error on the street; which means that you'll probably wind up quicker and more capable than the cronies you roll with on the street... maybe even your boyfriend.
Back in my day there weren't many women out on the track but nowadays you can also expect to find women who are of like mind, and you are sure to make fast friends with them (although there are always going to be those folks who are a little big for their britches, oh well). Hell, in my neck of the woods there is actually a track organization that is owned by a very cool, very nice young lady who started off riding on the streets. I am looking forward to working closely with her to help her promote her organization next season.
Anyway, there are, indeed plenty of ladies who ride on this forum and one of my first acts as moderator was to try and get a ladies specific forum up and running so that way there could be a place for us to outsource and get some feedback on things specific to our own respective predicaments. In the coming months I will eventually try to post up some more helpful stuff but I can't be the only one.