I need a Diet Plan!

It's really hard to have a diet plan, when I can see my favorite foods all the time and when I always enjoy eating. Like the other day, we bought Selecta ice cream. It's just so delicious I can't resist eating it. :D I think I am gaining weight everyday. I tried cutting down my food intake. At the office, I would just eat one fourth of the rice that is being served. But during dinner, when I am eating with husband, I just can't eat little. He would put rice again on my plate. lol. Another thing, my office mate would always invite me to eat snack. I can live without snack but she would always insist. Some times or most of the time she would pay for our food. Who can ever resist that? But I really need to have a diet plan, I am gaining weight already and I don’t really like that. Anyway, what I am thinking is that maybe I can just bring high protein snacks at the office, so that every time she would ask me I would just show her that I have my snack, and she can just buy her food, and we'll just eat together. I might even give her some of my snack, because she needs it too.It's like I am helping her while I help myself loss weight. Good idea, right?