It's such a hard question and has many different facets im sure with each different mental illness.
I've suffered from anxiety and depression for the last decade and it's affected me so badly that most of my 20s and early 30s have been in my house. From early on I accepted I had this anxiety.
However, a large part of my problems are health anxiety and I get a wide range of symptoms. I know I have health anxiety but as soon as those symptoms come do I accept I have health anxiety and get o. With it? No I spiral out of control so have I really accepted that I have health anxiety? Am I only able to say I've accepted it when I can overcome it and function like a normal person?
Is accepting you've got a mental illness accepting tablets that alter the chemicals in your brain? For years my GP, family, friends, many counsellors, hospital doctors/ nurses / ambulance drivers etc told me fighting the illness without medication was the best thing. I listened to them for a decade and only when I got to my worst did I accept the tablets and sought them out myself from the GP after earlier in the year a mental health nurse said she didn't think i was bad enough for them.
After starting them everyone tells me it's for the best and find out a lot of people who had previously told me it was best not to take tablets have in that time taken them themselves (?) And its really helped them. Which has made me so mad at everyone as the tablets have somewhat helped me although I'm gonna ask for my dose to be upped as I've felt more balanced than I have for a long time but still struggling somewhat. I feel like my own head and those around me have somewhat conspired and cost me a decade.
Being on the tablets a few months I don't think there's anything wrong with taking them and would advise people to take them if they're struggling and in a sense I get that could be hard for people and another sign of accepting you have a mental illness.