I always feel that too. When I convince myself (after checking my weight 10 times) I really am that weight then I start to think there's no way I could lose the amount of weight I have and I couldn't of weight over 300lb a years ago.
Oh yeah. Every time I get on the scale I'm convinced it's going to say, "Just kidding!" and move my weight back up to 177. Which is one of the reasons I weigh every day -- to be sure I'm really holding steady!
i felt like that too the last time i tried to lose some weight. i lost 8 pounds but i felt like i hadn't lost any and stopped dieting and exercising. i really should have kept going, i could've lost a lot more weight since then.