In my humble opinion, because OP’s parents are willing to pay for a HYPS-type school and it is pretty clear that OP would ultimately like to be in the US either practicing or doing research in medicine, OP should do their best to convince them that UCLA is not that far a cry from elite private schools in terms of prestige. In all likelihood, if OP spends another 7 or 8 years in Germany, they are not going to end up coming to the US because the path in Germany will be even more the one of least resistance. It’s best to make a fresh start as a freshman here and see what happens with respect to med school or biological research down the line. Just my two cents.