Lets look at this another way, your dad earns good money, and his claim is, truly successful people earn good money and rest are plebs. Ok cool, he is entitled to his thought process, but lets take a Nurse, doesnt earn a huge amount of money, but helps a huge number of people, saving lives, and making a difference on a daily basis - THIS is what success is. Success isnt about how much money you earn, its about what brings you joy and finding a balance between happiness and living reasonably comfortable.
Your dads success directly came from the teachers who taught him (by his measure those people aint successful, yet because of what he learned, directly from them, he became a success, like many others before and after)
Whilst its important to take on board what your parents say, you are now at an age where you decide whats best for you, you have done all you can - uni, good education, good grades, good job and if you still cant satisfy, there its not a you problem its a them problem (them been your parents)
Answer this question:
Which of the following would you prefer and think on it
Scenario 1: Working a high paid jobs in Finance, nice car, few holidays per year, nice house, and good savings - but as an individual you are overworked, never see your family/friends, depressed, sad, and unhappy - but you got the money
Scenario 2: Working a job you want, something you want to do, pays pretty well, but gives you happiness, flexibility and its a job where on a sunday evening you look forward to going to on Monday.
Im not saying you cant have a high paid job and not be happy, it does happen. But speak to most people who take jobs for money only and ask them how happy are they?
There is so many factors at play, in a nutshell, you do you. Do what makes you happy and gives you a long life and long good mental health.