are the tiktoks you post ONLY available in the country you post them in?

i live in a country where tiktok isn't a 'mainstream app' but i wanna make tiktoks. but I keep hearing that the tiktoks you make are only available in the country you live in. Say i live in Brazil. any tiktok i make will then only be available to Brazilians and will rarely be shown in other countries. is that true? if so, are there any ways to combat this? thanks for your answers in advance.