Please keep taking your insulin. While I understand that you want to look good, it's not worth ending up in the hospital with DKA.
There are 2 basic things to do:
Exercise more and more consistently.Exercise keeps weight gain at bay, for most people. Increased insulin sensitivity as a result of exercise, is a bonus.
Eat less carbs, so you don't have to dose as much insulin. We think about carbs only at meal times, I find, and only at a carb to insulin ratio, 'how much should I inject?', and that's about it. But if you added up how many grams of carbs you're eating daily, you'd be shocked. And in most cases, it's totally unnecessary. There's always a lower carb alternative.