In theory, the 24 hour clock makes way more sense, but I grew up with the 12 hour clock and it would take way too much effort to get mentally used to a 24 hour clock.
fwiw, it's far simplier to adjust to than it probably feels like
the crux of things is just
0:00-11:59=am
12:00-23:59=pm
0:xx=12:xx am
13:xx-23:xx=h-12 pm (or to think another way 12+x=24 hour time, where the x is the converted time... so say 17:34, 12+5=17, so converted time is 5:34 pm)
soon enough you'll be able to manually convert on the fly