How personal should you be during the “Why IB” question ?

You don’t need to get super personal if that makes sense. The tell me about yourself and walk me through your resume are essentially the same question and you will be asked some variation in every interview.

Hi, My name is John and I’m a super senior at Fake Cornell in Iowa but originally from the St. Louis Area. Although I was originally a psych major, during my first finance elective my freshman fall we learned about the stock market  and I found that super interesting. After that, I joined the investment club and learned about banking [from Susie if she works at the bank]. The summer after my freshman year, I interned with [we love €] and loved the work and knew I wanted to be a finance major. That summer I started investing in Robinhood after a bet with my cousin. When I returned to Cornell in the fall, I switched my major to finance. Outside of school, I’m on the varsity quidditch team, serve as a mentor in the local middle school, and wash dishes in the dining hall.

This is similar to what mine was like. Hope this helps. I wouldn’t talk to much about being low income, specific races, first gen unless it’s on your resume through a club or questbridge or something like that or you’re at a diversity day. 
 

Your interview isn’t a gofundme so don’t make it a sob story.