Having sex for the first time is not a goal post which you have to announce. It’s like gay people being asked to come out of the closet, that’s so weird, it’s your body and your sexuality. The most important thing is that you love and respect yourself in this. Losing your virginity is not something ‘bad’ or ‘sinful’ you have to confess or something that makes you a more mature or cool person. You can be open about it and when the conversation goes there you can share it with your parents, but you don’t need to tell them.