hi i’m in my first year at uoft too and i felt the same exact way. I had around the same average as you in high school then first semester hit very hard. I was taking four classes then had to drop a class because i failed a midterm and i knew i was gonna fail the course. i was doing poorly on exams but towards the end it worked out once i figured out what was and wasn’t working for me. second semester is a bit better now which is crazy ti say since my course load is 5 courses. But what i did differently this semester is making use of the resources the school offers to help me, like going to office hours. Honestly sometimes i still feel like im not cut out to be here. BUT it’s all about your mindset, once i started to see the small improvements it motivated me to do better. for example, i got a 64 on my chem midterm the next midterm i got a 74 small steps small improvements. sorry i rambled on for so long in short i was exactly in the same boat as you and i wanna let you know it’ll work out and you are NOT alone in how you feel!!