...dreams about to die...what to do>>>?

more than anything i want to exchange to germany next year. im am an 18 yr old american girl and i would do this between after graduation and take an extra year before college. its only 8,ooo and i want it soooo bad. but my parents are against it. my mom cant ever make a decision. i know ill regret not doing this...what should i do? if i go out on my own and do something against them, im never allowed to come back. i cant ask for money or anything. i would have to pay my own way through college. im so lost....but this is an opportunity i cant p up