Poo/fart smell and only 14

 Well I'll try and keep this short and to the point, I'm 14 and I smell like poo/farts. I have perfect hygiene and I've done a lot of research. I'm unsure on whether or not I have leaky gut, but the smell, which comes from my pants area usually, smells like farts if I eat foods you're not supposed to while repairing a leaky gut. If I just eat fruit and salad and vegetables, I get a poo smell. I realise leaky gut is gases coming through the skin but if these smells are occurring from my pants area (70% sure) and not let's say my armpits, why do I smell like poo and farts? The smell gets worse when I'm stressed or worried and also gets worse and more noticeable during physical exercise. What should I get tested for? Can you give me a diagnoses? What should I eat? Please help!! I make sure to wipe perfectly so hygiene is out of the question. Feel free to ask any questions, any help would be greatly appreciated.