I'm not sure what you want here.
I'm a possible istp so here are my thoughts.
1. What do you really want? If you are unhappy, why not go get a job that you like? Are you afraid of your parents or being homeless?
2. Why going back to school? You didn't mention what you want to study so it seems like you want to go back to school not because of passion. Rather, you just want to escape amd live in a bubble. School is an expensive way to be shielded.
3. I have the same situation as you. Chinese parents and family business and I have business degree. Obviously my parents want me to work for them but I wanted something of my own so I started my second company and is doing quite well. Iknow that business is not your thing so why don't you find something you lIke and do it?
4. Istp loves efficiency so your dad is probably tired of inefficiency when you are not working hard.
5. I don't know how other istp thinks but if I have a child, I won't care how much money he makes as long as he is doing something productive and not wasting his time away. I suspect your Relationship will improve when you can show that you are not a slacker and truly doing something he likes.
Hope this helps.