…and undergrad in Europe is 1) much more restrictive than in the US, in that (usually) you apply to study one subject and only one subject; 2) you are expected to already know the system and navigate it - as an adult- with not much help from the university; 3) most are essentially commuter colleges, with most students living out and much less emphasis on school spirit; and 4) there is generally no way to transfer in: you have to start at the beginning so as @insanedreamer points out, you will lose all the credits you have.
A masters is probably a better way to go.