Becca,
You will get over your stop-sign phobia. I don't know how long you've been riding or how long you've been riding clipless, but I'm guessing the pedals are new this year? It just takes time and repetition.

I had a few falls when I first got my pedals and for a month or two I was very nervous in them. It took me probably 3 months of regular riding to really feel completely comfortable and confident that I could get out quickly when necessary.

After two years of riding, I recently took a mountain bike clinic (my first time ever on a mountain bike) and decided to use clipless pedals. I had to bail multiple times (turns out I'm clutzy on a mountain bike !) and each time I got out of the pedals with no problems and no anxiety.

Extra-vert,
practice, practice, practice! pick a hill you know well and ride it often. Once you feel comfortable, start pushing yourself just a tiny little bit beyond your comfort zone each time, in a controlled way. Remember you can always pull it back...