manipulate diet is priority 1. for training, do you have long breaks between sets? if so, that could explain the lack of sweat. and how cool is the gym? for cardio, if you want to cut fat as fast as possible, start doing 20 minute sessions of hiit training. you dont even need to be at the gym, i think its better on the street because of the fresh air and the actual pavement feel rather than keeping up with a belt.
and keep lifting heavy