Is it correct?
So if I want to say something like this:
'you confused me with someone else'
This is correct, right?
What if I want to say something like this but about things:
'I confused the numbers' or days
What is the better way to say this?

Question

Is it correct?
So if I want to say something like this:
'you confused me with someone else'
This is correct, right? 
What if I want to say something like this but about things:
'I confused the numbers' or days 
What is the better way to say this?

Answer

I feel a more authentic way to say this would be 'You have (got) me confused with someone else.'

As for days - 'I got the number of days confused'  or  'I got the number of days mixed up'

Answer

Hi Victoria!

If someone has confused your information with someone else, it's more polite to say, "I think you've confused me with someone else".

Using I "I think.." is polite because you're are not trying to blame the person for being incorrect.

If you're dealing with numbers, like a math problem, you can say, "Sorry, I have (I've) confused the numbers". If its days, "Sorry, I've confused the days" - so on and so forth.

ご自宅で快適に語学を学べるチャンスをお見逃しなく。経験豊富な語学講師陣の中からお選びいただき、今すぐ最初のレッスンにお申し込みください！