It’s not uncommon for people to be diagnosed with ADHD for the first time in their forties and fifties. The diagnoses barely existed when we were kids.
Obviously, you need to get professional help, but as you point out, the world has bigger problems right now.
SO you have a problem of what to do in the long run, and what to do now.
For now, arm yourself with information. It sound like you are suffering from rejection sensitive dysphoria, which is the real killer of ADHD. Not are you more sensitive to rejection, your likely to receive more of it, particularly as you are meeting resistance from friends and family.
There are a lot of good articles on this sight about rejection sensitive dysphoria. I hope that you read, and realize that you are not alone in this. A lot of us struggle with it.