I feel like I've ruined my life!! :(?

Originally when I was unsure of studying medicine or economics, my dad hit me nd manage to get all the other church members to convince me to study medicine and i wasnt totally against it either, eventually i didnt get the grades but got a gd grade at economics...so now thats what i definitely want to study but now im studying it at a not very good university and it seems virtually impossible to get into IB without going to a good university, my plan is to study bsc economics at Bradford (taking some a-level maths module along side to push my maths grade up from a C to which Igot at AS to A in the first year of uni....dropped it in as because i was persuaded to do the traditional thing which is do a bioscience nd then medicine but it didnt feel right so i declined my offers at very good universities reapplied for economics)..Find a good investment banker as tutor during holidays (will be very difficult but still possible and I will find one), get a first at Bradford and do lots of summer internship, possibly learn french in the second or third year (but thats not certain depends on how i feel im doing) and then do a MBA in International Finance and Management at LSE (hoping that this puts me in a gd light and maybe covers for attending a poor university for a degree), and have good networking. I am writing this because even though I have exams and should be more focused on them i just spent the last hour in anxiety, I dont want to take a gap year, I cannot stand living with my parents anymore. Is this plan good enough to get my into IB...any suggestions are welcomed. Thanks