As previous posters have said, this is a heavy schedule but seems pretty typical for an ambitious engineering student. Since I went to a school with a quarter system, I took at least 18 credit hours every semester, usually at least 19 and I was fine. Can you skip a field hockey practice here and there? You may want to find out before embarking on both at the same time. Be sure to keep up with problem sets in Calc and Physics as a refresher as you go. As someone previously said, if you drop anything (i.e. if you have to because you’re not supposed to overload as @stradmom said), drop either physics or chemistry; you have your whole first year to get your background courses out of the way.