Sim... * It's not my business... Não é da minha conta, não é meu problema it not your business = não é da sua conta, não é seu problema

Yes, sounds ok, but probably more common is "it's none of my business". Usually someone says that right before they say "but" and ask something that is none of their business lol. If I tell you "it's none of your business" it sounds strong, even rude. I can think of more polite ways to tell a nosy person to mind their own business. If I say "it's not my problem" that's different. That means I don't want to get involved or help and probably don't care about whatever it is. ;)

Oi Catharina! Obrigado pela sua expressão. 👍