> I live in europe and basically all mc/visa are actually debit cards.

I doubt that is true, can you expand on that with some references?

I know there are many cards which are both a credit card and a debit card but that just means two cards in one package. But credit and debit are still fundamentally different networks with different rules. A debit transaction hits your account right away and the money has been taken out. A credit transaction settles later and can be paid from any source, it is not tied to any specific account.