I joined Bally's out in Beaverton and they were super nice. They did a walk through when I first joined and showed the machines off. I would ask people about that.
Something else you may want to consider is that you are super self conscious right now. It feels like everyone is staring at you. I've noticed this but I also know that it is not all the way true. Yeah, some people will look at you, but most of the people there are super nice.
Another thing to do is as you see people on a machine that you don't know anything about, go ASK them about it. Just let them know that you don't know how to use the machine and that you were hoping they could show you. They respect the fact that you are trying to lose weight and for the most part are more then happy to help out. Plus, you may find yourself a workout buddy or two which could also help motivate you even more.
I have an hourglass figure, unfortunately it holds 8 hours instead of just 1.