I will start with a couple of caveats. First, I am dealing with ADHD - Combined type. second, I have known about my ADHD since age 15, medicated since age 17. (it's amazing what 2 accidents within 6 months will do for rushing to find effective treatment)
I have alternated between success and failure for most of my life, and have come to the conclusion that I am the most successful failure I know. I flunked out of a prestigious college out of high school, locked myself into a dead-end job, joined a loveless marriage (to rescue the person), and became complacent with my lot in life. I have since discovered non-traditional colleges, graduated Cum Laude in Business and have now completed my MBA. I am now an accountant, an accounting and business instructor, married to a wonderful (unfortunately confused by my various trains of thought and emotional rollercoasters) woman, and have 3 wonderful children, 1 of which I am watching closely for ADHD symptoms not explained by toddlerhood.
My wife and I have purchased our own home, and through my creative, problem solving ability, and her organization and persistance, we are accomplishing our family goals.
All of this from a failure, a mediocre student in High school (not that I didn't do the work, doing it was interesting, just that once it was done, it never got turned in, a common ADHD problem), a college flunk-out, dead-end customer service rep, divorcee, scatter-brained, person.
I know that there are other "failures" just like me, and offer these words of encouragement: ADHD does not define you any more than Diabetes defines the diabetic, Cerebral Palsy defines those who suffer with it, or cancer defines those who withstand it. What you do with your "disability" defines you. I am an incredibly successful "failure," just as my father was an incredibly successful diabetic, just as a dear friend was an incredibly successful "handicapped person," just as my mother not only survived cancer, but used it to turn her life and perceptions around.
I apologize for what can be seen as the ramblings of a crazy person, but I am an incredible optimist and believe that ADHD, while attached to several problems, offers opportunity to its "sufferers" for incredible success. Not bad for a "failure."