Your parents are trying to help you. You should listen to them. They are not trying to "seize control" of your money. They are trying to keep you from pissing it away for no reason. You may not be insane, but you are not acting reasonable either. By all means, follow your dreams, but not like this. It's not just "risky" - it's extremely risky AND competitive, and not something you just dive blindly into. You WILL lose money that way, I can assure you. You are in way over your head, and would be far better off putting your money in an account like your parents want. In the meantime, before you go spending any money on your move, actually finish writing your movie, which to my understanding, isn't done yet.
I don't mean to be harsh, but I couldn't stay quiet in the face of what I see as a serious mistake. This is not the right way to go about things, no matter how much pressure you feel to start your film-making career. I will also mention that someone already made a movie with a similar premise to yours - it wasn't very popular - it's not a premise many people feel comfortable with, even for entertainment purposes. Fair warning.
I would rather you be mad at me for telling you something unpleasant, than you end up dumping all of your money into a poorly planned project, and losing all of it, and having no movie, and no money. I once wasted $10K on something I thought was important, and lost it all cos I didn't plan well enough - I still kick myself for it.
Trust your parents on this one.