feeling overloaded is very common in the first term because you don't know what's expected of you or what you need to do to achieve what you want
no degree is truly impossible though and everyone who wants a balanced lifestyle can achieve one
my course has a damming mix of maths, reading and even some computing - i don't have the discipline to do all of it and i didn't do any of the reading for the first year. the way i got around it was by only doing the work when it lead to an assessment, for example, i did read as research for essays and i did problem sets as revision for tests. but i would rarely do the preclass work for seminars
i'm not recommending this - although i did get a safe 2.1 - im just saying find what works for you because something will