Is this a good diet plan?

That sounds pretty successful. That is very good you added some sweet each day like a candy cane...so then you wont FEEL deprived. Good thinking. That will definitely help. Try to aim for at least 4 servings of vegetable. With your weight I bet you could lose ABOUT 50-60 pounds by summer. HECK! thats great though. PROBABLY even more. Make sure to eat protein though cause that boosts your metabolism and keeps you not feeling hungry.