Medical school is challenging!
There is a high volume of material to be learned, and students at McMaster are challenged to identify what to learn, how to learn it, and when to learn it, from the very start, just as they will in their clinical years. This may require some adjustment in your learning and study strategies to ensure you are using the most effective and efficient methods.
Learning in a problem base curriculum is quite different from more traditional didactic lecture based formats. Students who are unfamiliar with this type of learning may have some difficulty making the transition. Working independently and then processing the learning in a small group setting can feel quite different. Sorting out how to contribute to the learning of others while learning oneself can require different approaches.
This is an exciting and stimulating time, but if you feel that the adjustment is difficult for you, it is a good idea to seek advice earlier rather than later.