I'm not fat, I have 70 kg. I'm 35. Even though it's about -10 degrees outside, I have sweaty cakes on my T-shirt. Could it be that I'm terribly shy and I feel terribly embarrassed outside people?
But if you sweat in another environment and you are alone, there may be more causes of sweating. Does your blood pressure not rise? Shyness and tremor can also cause sweating.