Firstly, your children are not you, they are different individuals, who have inevitably are having a different upbringing.They will follow their own path, which may be very different for each of them.
Secondly, experience of life, even the bits I wish with hindsight I'd done differently, all helps to put me in a position to guide my children, with awareness and empathy. (I hope)
Thirdly, there's no hypocrisy in not choosing to reveal to DC things I have done. Not steering them away from ' sex,drugs, rock and roll' would simply be bad parenting.
To give a minor example, by the age of 15 I had worked out multiple ways of truanting and not getting caught. Did I let my DC know that ? Hell no. With one of them, I used to deliver to school, watch them enter, and contemplated sitting outside in my car all day long, if that was what it took to sort out their brief school reluctance.
My DC think they know lots of stuff from my wild youth, but in reality, they don't know the half of it.
I think it' s made me a tougher but less judgy parent, if that makes sense.