You are eating more calories than you are burning, therefore your body will store the excess as fat. The T is not what's doing that...it's your eating habits.
It's normal to gain weight after taking T, because your muscles will most likely grow and pound for pound they weigh more than fat. However, to get rolls of fat means that you're eating at a calorie excess. Really, the only people who can do that and not become fat are bodybuilders and athletes, because they are burning huge amounts of calories.
It's also normal to have an increased appetite, but in order to not gain a lot of weight, don't eat at calorie excess.
I just had a lower surgery op, and I'm not allowed to lift or do strenuous exercise for 2 months. Before the surgery, I was lifting and training on a regular basis. So my calorie intake at the time was pretty high, but my weight gain was mostly muscle mass. Now that my circumstances have changed, I've had to change my calorie intake accordingly, but the large appetite I've had ever since starting T has remained, regardless of my activity level. Ultimately, it's just down to portion control and being mindful of what you eat. As advice for diet, I would cut down on any processed food especially carb and sugar laden ones, it will make a difference.
Losing weight is not just aesthetic, it will probably improve your mood, energy and your general health.