Being selfish

I have always wanted to weigh less, but felt I needed to be polite and eat what was in front of me or have the roast when visiting family.
I do love food, too much.
This diet is soley for me, I have lost 21 pounds (10kg) in 3 weeks and I'm not putting it back on, I'm being very strict on my diet, to the point that I'm scared that if I just touch something not on my diet I will gain it all back (and knowing my past diets this has been the case).
I am slowly working up to a diet plan that allows me to eat without losing weight and allows me to stay at my goal weight.
This is all very selfish I know, but for my health and for my self esteem this is a necessity.