Firstly, well done on your loss so far. I said this in a similar thread today already, but the key is small goals. Whatever is a comfortable goal for you to mentally work with. It might be working towards your next award, so half stone increments. Maybe going a whole week on plan. Or if you're really struggling at looking forward, just getting through a day on plan.
I started with 7.5 stone to lose (as a minimum) which was a scary number. I've never thought about the big number, just made the decision each day to stick to plan. Have lost nearly 3.5 stone so far using that approach.