I agree with what others have said. Back a few years ago I was 25-stone, and was facing a 155-pound loss to get to goal. I lost over 90-pounds of that before I stopped dieting, so know it's do-able.
Just stick with it, take it one step at a time, and set yourself mini-goals so it doesn't seem so daunting. For me, I took it in stone stages...seeing how long it would take me to get down to the 19s from 20s, and so forth. Made it feel more managable, as 14-pounds doesn't sound so scary.