Hi Captain
Its great to have dreams and im not shooting them down..
just take into consideration these things...
Friends of mine from Riddle, 23yr old captains,yes 23, with thousands of hours
applying to CX or SQ etc.. with the usual reply of 'nah we dont need you'
Friends of mine with thousands of hours and getting a CX interview only to get it and be shot waay down cause they couldnt answer basic questions bout monsoons and aerodynamics which schools in the U.S skip over (get handling the big jets to make up for Riddles oversights)
Your best bet is to get your CFI, get a few thousand hours TT and 100-200 multi time, learn how to control an airplane then apply to the myriad of underpaying regionals in the U.S
Getting a regional job is way more likely to happen than CX, it will also teach you how to bleed and suffer so that when you DO get that 747-400 job
you are gonna appreciate.
but hell if YOU can pull off getting CX good for you...you'll be a miserable kid doing it though....