How to tell my parent/s that i'm having intercourse

Heyya, I'm an Auzzie teen and I was wondering if anyone could relate for a minute. Both my mother and father are, have been, and will be 110% overprotective. That will never change. However, my current boyfriend and I had sex quite a while ago. (Yes we're both legal!) I'm not here to complain about that because however sappy it is, we are in 'love' and intercourse was another way of becoming closer and more intimate with eachother. What I'm trying to get advice with is that, a few days ago, my mother said to me 'when you start getting intimate with -----, you'll tell me, right? At least a month before?' And I could only sit there feeling really guilty. Should I act like I'm a virgin and I want to do that, so that I can feel less guilty (although that would be considerably embarrassing) or should I just go on like nothing's happened, or tell her? I've never had a close relationship with either parent. I have depression, social anxiety, general anxiety and schitz, and this has stressed my relationship with them past breaking point many times. I'm not entirely comfortable with this, and I'd like to know if any parents, or people who went through the same, have any advice.

The reason she wants you to tell her a month before is so that she can ensure you have adequate contraceptive and STI protection, and to make sure you know what you are doing. She will find out sooner or later, so I would tell her now. Don't try to live a lie. She may already suspect it anyway. Also, knowing your mental state, she may well want to support you as much as she can. I would have the same concern; being a parent of girls I understand. Try and mend the relationship with your parents - you'll need it sooner than you may think. On the otherhand she may feel sad or angry, but it is best to face up to that now rather than later when things could be worse.

The problem is that it is not just that "intercourse was another way of becoming closer and more intimate with eachother", because intercourse is much more than that. It is a bonding activity, and can detract from the other mental and emotional ways of getting to know each other better.

I hope this helps as a start.