As non-native speaker the following always puzzles me.

When somebody asks the question "Do you mind if  ..." There seems to be two responses possible.

• "Sure" and "No, not at all" which both mean that the person doesn't mind
• "Actually, I do mind" which means that the person does mind

Why is this so confusing? Especially, how does it come that people reply "Sure" to this question, as it could be understood that they "Mind for sure"?

The following always puzzles me as a non-native speaker.

When somebody asks the question "Do you mind if...", there seem to be two possible responses.

1. "Sure" and "No, not at all", which both mean that the person doesn't mind.
2. "Actually, I do mind", which means that the person does mind.

Why is this so confusing? Especially, how come people reply "Sure" to this question, if that could be understood to mean that they for sure do mind?