“infatuated”
“major of choice”
Spend some more time marinating on the Oxbridge (and other UK) websites- learn what they want, how they work, what the course is actually like, year by year. How you are taught, how you are assessed.
You get 5 UCAS choices for the price of 1, so also consider Durham (collegiate like Oxbridge, great college experience, high likelihood of acceptance, ranked #3 for chem after Ox & Bridge), St Andrews, Glasgow, Exeter, Edinburgh and (if you want a London option), Imperial.