Want to switch from Medical school to Finance/Investment banking

Hey guys,

**My background: **
I lied, Im actually a podiatry student. I've had a short history, I was a bio-engineer with a mechanical minor as an undergrad, graduated slightly early from an average tier college (Santa Clara university) as an average student, struggled with medical school admissions and ended up in a podiatry school. While its podiatry its pretty much like med school and the career prospects are about the same as a family doctor, pediatrician, etc (an annual income of 150k-300 ) starting by the time I am 29 (Currently 22)

As an engineer I was fantastic with math, data analysis, problem solving etc. I had a knack for making inventions which lead me sort of towards the medical field to eventually get a degree as some kind of doctor and join a device company. I am starting to doubt myself and considering a career change

**My Dilemma/ Decision making **
Right now I am looking into going back getting a masters in computer engineering (maybe mechanical engineering since it interests me), getting a 100 k job at a silicon valley company as a computer engineer and living a regular life however one of my friends did inform me of investment banking

1. Im currently 22 and read that after 22 it's unlikely I will ever be accepted as an analyst role into an IB bank, is this true?
2. What additional schooling would I need to go thru to even have a shot at this bank? Based on my research looks like a top tier MBA, but that would make me 25 by the time I am done applying, going thru school etc.
3. I hear obtaining IB positions is incredibly difficult, tbh my friend was always an average joe in high school and college, do you NEED to have contacts in the industry?
4. Do they fire people easily, and for what reasons?
5. What do people who don't make it through do after?

One of my uncles, is decently well known in Hedge Funding, and manages his own (Pabrai Investment Funds ) , how do you climb the ladder? Is it lots of butt kissing? Pure brilliance?