I've been pretty damn good at ignoring bad advice and stubbornly following my own path, though obviously there have been mistakes along the way. Here are some of the worst:
School's Career Adviser
Your ideal career is as a hotel receptionist (this advice was based on a very odd computer programme, which also told a friend of mine to become a chimney sweep. He later graduated from Durham and now has a career somewhere in the legal profession, I think).
My Father
Oh, where do I start with him. If he was around today, he'd rightly be accused of psychological and emotional abuse. Looking back, it's hard to distinguish where his own mental health problems ended and his abusive behaviour began.
I'm glad I ignored his advice on how to treat people of other races, which career to pursue, how to treat women and many, many other things.
I'd probably get chucked off DS if I repeated some of the 'advice' he gave on matters of race, but on women, it went something like this: "When you get married, don't allow your wife to have too much freedom. If she's home late for work, ask her where she's been and check. If she's out without you, make sure she is only around women. If she's around men, even as part of a bigger group, it'll cause problems with your marriage."
This sort of lunacy extended to his views on all sorts of other things. Poisonous old drunk!
My Mother
As I recently discussed in another thread, she wanted me to pursue a career in classical music, even though it was only ever a hobby for me, and even then, only one really pushed upon me by her. She was trying to live her own unfulfilled dreams through me.