This is for you and you alone, your decision, your life. I understand you're concerned about disappointing your father... but he isn't living with your debts, needs, and struggles. Please don't take that wrong..
Live your life how you want to live it. If that's working for a dealership, go for it! I can imagine it'd be fun! I love working on cars and what not, but I don't have the demeanor to be a saleswoman at an auto dealer.
I understand why people don't go to college, you get in debt trying to make a better living for yourself in an economy that a college degree (pending on where) isn't as important as it used to be. My husband never went to college, but he now works for the Government and pulls in just as much as a graduate would.
Do this for you; no one else. You're looking out for yourself and your future.
Good luck! :)
The Fluffy Equestrian
Rhett | Hang on "Fiona" | Rockstar
Reg. TWH Gelding | Irish Draught Horse Mare | SSH Gelding