Are ADHD people bound to be a failure?

Never got diagnosed. Super expensive here in Australia. But in my early 30s. Always have been a prodigy in younger life but I don’t know feels like wasted all my potential. Don’t know what to do with my life. Wanted so much to do but the grief and lack of success and the grief of not seeing my fullest potential in life is killing me from inside.

Any suggestions? Anyone with ADHD who has turned their life around around 30?