You'll get better in time and you'll feel more confident the more you ride. Definitely don't get discouraged. I fell just a couple of weeks ago myself. I make sure that I unclip one leg (always the same leg) well in advanced if I know I'm going to be stopping or there are a lot of people coming up ahead. I'm still not 100% in the clips but I definitely like the way it feels when I'm clipped in and riding .. just not when I'm coming to stops I don't expect. Also, make sure you check your bike since you fell. I loosened my seat after my fall and didn't realize it until 3 uncomfortable rides later. Check my blog for more info!