You're confusing anabolic steroids with corticosteroids like Dusty said, there's no performance gain to be had from corticosteroids. Whatever you think you're getting from it is in your head.
"In a counterbalanced, double-blind design, 1 mg ACTH or placebo was injected into 16 professional cyclists. They cycled for 1 h on a bicycle ergometer at a submaximal level, defined as 60% of maximal performance on a pretest with a load increase of 50 W per minute. After 1 h, load was increased by 10 W per minute until exhaustion. No increase of maximal performance was observed with ACTH, either on the day of drug intake, or on the following day, although substantial increases were measured in physiological variables such as cortisol, glucose, and white corpuscle concentrations. Feelings of fatigue, which were continuously self-rated, were diminished only during submaximal performance. The present technique of systematically distinguishing between physiological, psychological, and performance measurements could help in explaining the persistent belief in the performance enhancing properties of ACTH and other doping substances."
What they are seeing is an increase in cortisol, and in theory that could increase energy since it will rise your blood sugar but in tests it doesn't increase performance at all. (I think this is the "energy" thing people are talking about, but feeling energetic doesn't mean it will increase performance, recreational drugs can make you feel energetic too, but they're not going to make you run any faster, they make you run slower).
In fact it has been shown to weaken performance because it can induce myopathy.
I have been on entocort, it did absolutely nothing performance wise, I have never heard of anyone doing sports who got a benefit out of it, it does nothing.
Something like creatine increases performance, anyone can get that if they want to, but I took it as an adult and not for some performance enhancement, it also has nowhere near the possible side effects as either corticosteroid or anabolic steroids, it's also not something that kids are supposed to take.