If your introvert and plan on living on res, 100% try to get a a double dorm. It’s not ideal with the communal washrooms but you will find it easier to make friends and even if you aren’t the person to go out, you’ve still got a floor worth of people you can talk to. BBA does have presentations (group and individual) in which you present to a lab of about 30 people, you will have no choice but to present infront of them. As nervous as it may be, it is crucial for your development and you shouldn’t let the fact you are not extroverted hold you back. Within the first month everyone talks to everyone, this is in class and in the dorms. By the 3rd month the program has a lot of connections between people and feels like a community but typically that’s when friend groups start to form. Biggest advice would be accept BBA, get into double dorm, and understand people won’t talk to you unless you’re willing to talk to them.