Definitely DO use this medication if you need it - it's the first medication your doctor will likely ask you to try precisely because an extensive body of research says it's the most effective way for treating ADHD.
1. People take it as a study drug, without prescription.
2. There may be over medication. Doctors will sometimes feel pushed to prescribe (as is known to happen with antibiotics)
3. At an individual level that is true, but you may need it because of your society and environment. Both ADHD rates and treatment varies between countries (even between regions and states within countries) and has varied a lot over time, which implies some external factor affects it.
I think untreated attention issues (if not the rather narrowly defined condition labeled "ADHD") are rather widespread. And society doesn't help, just look at the checklist of things you need to do on an ongoing basis to just keep a vehicle running for transport in the US, which pretty much everybody outside a city needs, and even many city dwellers elect to procure as well.