How to beat my junk food addiction

I am new here so hey everyone! I have actually been gaining a lot of weight and have been going to the guy too but haven't seen a difference. I am 58kgs/ 158 cm and have a severe junk food addiction (which I believe is why I am not losing weight even after gym). I like in a hostel/dorm (whatever you may call it) and have limited ways to get healthy food (excluding hostel food) as we don't have a fridge available. I am extremely bloated and keep gaining weight. Can someone suggest any workout videos or tips on how to get over this?? I desperately need it