If you accept the expectations of others, especially negative ones, then you never will change the outcome.
As a dad, he thinks that his philosophy is morally correct. He has no conscience whatsoever about letting his kids put a penny in a light socket to find out electricity is not so good for you, and if you want to learn how to swim, you have to be thrown into the deep end.
Your work isn't just to learn and say the lines. Your work is to figure out what the chatter in your brain is, that's going on under the lines. It doesn't matter whether you're speaking or not speaking because your mind is working the way your character's mind would work.