There are multiple solutions for your problem, so you have to be more clear about the nature of your project. What is it for?
Do you need to distribute it on large scale as promo video for a company, or just personal project?
Does it have to play on TV sets, PC computers, Mac computers? All that things define the way it has to be done....
Project you created is DVD video format, that have structure and strict rules that are designed for dvd video discs. So that is something that won't work on usb drive....
It has to be redone from the ground in some other software, I'm thinking Adobe Director, or Adobe Flash....
That way it will work on both pc and mac computers.
Let me know if you need any more help with this.
I can make you tutorial, or do complete job for you....
Thanks,
Ivan