Speaking from both a personal and a chemical perspective, the brain starts developing differently whether or not you take the medicine from an early age, you're just picking what kind of fucked up tardchild you get. For as over diagnosed ADHD was at the time the kids that got given it willy nilly usually grew out of it. Adderall literally hits differently for people who don't need it and they'll eventually pick up a cup of coffee works better for them.
Way back then? Dota 2 came out in like 2012 my dude and it's gotten more Eastern European women beaten than vodka ever did.
Idk about the grew out of it part. Coming from being sober myself after years of addiction. I run into a lot of addicts that are sober, or are trying to get sober. And a shocking ammount of them were "diagnosed adhd" as a kid, and given stimulants by a doctor.
Now decades down the line a lot of them end up with substance abuse disorders, mood disorders and all the bagage that comes along with those.
I can't 100% prove that giving a child amphetamines everyday from the age of 10 changes their brain chemistry, and leaves their brains permanently under producing dopamine and serotonin.
But anyway. All this is getting away from my origional point. Which is, self improvement is completely on the individual. No one can change how you feel, except you. Therapists can help find some underlying issues, if they are a good one, and you are lucky. But even so, that still doesn't change how you feel. They can recommend you do the samethings that literally anyone would tell you to do i.e. eat healthy, pray or meditate, get some kind of physicsl activity, etc. But paying someone to get tricked into doing what you already know you should do is dumb.
And then drugs. They just cover up symtoms. Which, sure when you have a cold, or an injury is nice. But when covering up the symtoms means you ignore the actual issues. Like with depression and anxiety. Then it's a net negative to take them. Especially with the expectation it wjll actually help with depression.