Given your own description of your father -LOL-.., it seems highly unlikely he is going to prohibit you from having what you want anyway???? If he gets angry with you and then changes gears consistently.., why not just be totally honest, not risking the "debt" of dishonesty?
Parents tend to remember being deceived for a loooooong time..., simply human nature. It sounds to me like your dad may not exactly speak your "lingo" at this time of your life, but just sit down and talk it over with him.., giving concrete examples of why you want what you want..., instead of playing the "power struggle" garbage and damaging the relationship.
The manner is which you speak about your parents is bothersome to me. During various parts of your posts, you refer to them as "dumb".., "not able to understand"..., and "ignorant", when there are far more respectful terms to use. While it's certainly not unusual to have those thoughts about authority figures when you are young.., it is another thing to post them in a Forum of strangers. If you stop to think about it.., it reflects far more poorly on your character, than that of your parents.
I'm guessing your parents have supplied you with a safe place to live, food, probably the computer you are using to insult them publicly, and an unmeasurable amount of support in various forms you don't yet recognize.
Maybe you should just stop typing for a while.., and consider the total spectrum of their stupidity vs. your own.., and maybe turn over a new leaf?? ~~> Or maybe grow a whole new plant???
I hope this all works out for yourself and family.., but it sounds like the problem runs a bit deeper than your knife of choice...
Take care!
"Hunters seek what they [WANT].., Seekers hunt what they [NEED]"