Side track and ignore this if you want but it seems like you are making some major life decisions at 18 predicated on an assumption that you want to be an investment banker.
I had spent my career as an investment banker and over that time interviewed hundreds of candidates. When interviewing rising college seniors for summer internships typical question would be what made you choose your area of study in college. People can be all over the place as you would expect.
Exception being a cohort that studied finance and would typically respond with some variation of I have “always” wanted to be an I banker. When I would then ask the logical follow up of why and what do you think investment bankers do on a day in and day out basis very few could answer precisely or accurately.
So I ask this earnestly why would you want to be an investment banker and what do you think the average day looks like for an analyst/associate?
If you are comfortable that career path works for you great but just want to make sure you aren’t pursuing a title vs a career that interests you.