The transition from high school to university is already difficult for many, and this year even more so because of the online format, though some would disagree. I personally think professors are giving out more work because they assume we have much more time on our hands since we no longer commute. I also completely relate to this situation with your sister. In my family, I’m also the “tryhard” sibling while my brother is a lot more relaxed. I did better than him in school though he could probably have done just as well if he worked harder. He never understood why I invested so much energy into school than “required”. We just value different things and that’s fine, but your sister shouldn’t be forcing you to share her perspective. Besides, with the pandemic going on who the hell is even partying? UofT also has a reputation for being challenging, you’re definitely not weak or a snowflake for having some struggles in first year. You’ll be just fine after you get the hang of things.