How realistic are my immigration plans?

Hey everyone. I am current a high school sophomore, and I wish to leave the US after high school for a variety of reasons. I don't have another citizenship, nor claims to get one. I know French and German at about a B2 level, good enough for daily life but probably not for schooling. My idea plan right now is move to Europe for school at 18, graduate at 21, citizenship by 25. Given my circumstances, top choices right now are Belgium, Switzerland, and Germany. So really, my question is, how easy is it for immigrants to integrate in those countries? Are their immigration processes straightforward, and how hard is to to be granted citizenship? How hard is it finding work as a foreigner?