The problem with these diagnoses is that most of the time they are only an educated guess; as in your doctors "opinion" and depending on the quality of doctor they can be very close or far off the mark. You don't take a blood test to find your mental ailment and there's no real way of knowing when for instance your depression is an inherent chemical imbalance or you're simply really sad, and who's to say chemical imbalances aren't natural character variations anyway?
Of course there are exceptions and I'm not trying to take away the legitimacy of anyones struggles but I think that overall people label and categorize themselves too much and the umbrella for certain "conditions" like ADHD have become so wide that technically everyone has it to some degree which I think harms the people who really struggles with it.
It's also worth noting that pharmaceuticals is a multi-trillion dollar industry that is heavily incentivized to keep us buying their products and that's one of the reasons you're given pointless diagnoses and immediately told what to take to fix them when a lot of the time it doesn't need fixing and in many cases the best case scenario is that it masks your symptoms to the point where you don't feel the need to solve the root cause (making the drugs actually detrimental to your longterm health).
This might be a long-winded and digressed rant to what was a rather simple question but I just wanted to remind anyone who is genuinely struggling that you don't have to define yourself by whatever condition you have and you don't have to categorize yourself to belong and be normal, most of all don't take everything your doctor say as fact because it isn't always the case even when it comes to physical ailments. Listen to them but use your own judgement, don't become reliant on drugs unless you actually
need them (as in you would fall physically ill or be at risk of harming yourself or somebody else if you didn't take them) because you
will be asked to take them even when it won't help you.
Thank you for your attention to this matter, have a nice day.
