There are 3 tricks you can try
1)Weigh yourself less. Even if it's only once a week, try and wait a few more days (or hours). You get really excited about getting on a scale to see progress, and you feel 20 pounds lighter but it's really only 3.
2)Put down mini weight goals that are easy for you. Like 2.5 pounds a week, this gives you some leeway, and when you go over a little you can feel super awesome
3)Think in terms of total weight lost. When you get on the scale just add that extra three pounds and say "Aha! I have lost 30 pounds. Go me!" And proceed to carrot dance
Bonus: Ignore the biggest loser. Every moment of their lives is centered around loosing weight. They've got a panel of professionals to train them, and entire days packed full of exercise. You can't give up your life to loose the 12lbs a week they can, but you're doing much better than alot of us! Keep up the good work
have another carrot.