Right now I’m taking creatine and beta alanine in powder.
Vit C and D
Omega 3
Nac
Turmeric
in terms of physical fitness I’m feeling good about my size and how I can use the body in the games. I’m feeling poor in stamina and also a heavy for the body, maybe I should be less heavy, trying to cut the weight a little bit but I’m struggling in deficit cause I’m feeling with less energy in training
Look, the situation is a bit more complicated than just injecting or taking something to improve your endurance. You're already using the most basic supplements, like creatine and beta-alanine. Of course, you could expand your stack with various experimental supplements, but at your age, your body doesn't really need them, and you're unlikely to notice much of an effect.
As for losing weight, I think that's a more reasonable idea because you're a pretty big guy. And even if we used something like retatrutide to make dieting easier for you mentally, it would still reduce your performance while you're in a calorie deficit. Because one way or another, you need a deficit to lose weight.
You should just see this as a temporary phase on the way to your goal. And there's no need to create a large deficit. Just give yourself more time to lose the weight. I haven't seen your physique, but I think 3–4 kg is probably the maximum you need to lose.
Using the rough estimate of 7,700 kcal per 1 kg of body fat, with a 300 kcal daily deficit, which is a relatively moderate approach, it would take you around 3 months. But you'll probably need to adjust your calorie intake quite carefully between training days and rest days.
Secondly, I think that as a competitive athlete, you should approach dieting more professionally in terms of discipline and willpower.
I mean, you're not a 60-year-old woman with diabetes who's spent her whole life eating junk food and now genuinely struggles to control herself and reduce her calorie intake. You're a young, healthy athlete who should be able to control his appetite if he really wants to.