HI @cloudedepiphany, late diagnosed ADD /ADHD here. Please be aware, it is common for us to be diagnosed with different issues before the right one is found.
Depression and generalized anxiety often simply mean that you are overwhelmed by the world around you. Which is normal if you are ADHD and not aware of your diagnosis, and have no acces to the right support, tools or meds.
You can now start to tackle that by learning about ADHD. There are many communities online that will welcome and share experiences with you. Look for 'late diagnosis adhd" on facebook or tiktok.
Many of these groups will not use the term 'mental illness' but the term 'neurodivergent'. Yes we are different. But not 'mentally ill'.