Well, I've had a two first times, in a way.
First story is about my first being naked in public, I mean the first conscious time. I was 10 years old and went to the swimming pool with three of my class friends. During the after-swimming shower we still had our swimpants on, because everyone always had. Then, I noticed a men having a shower fully naked, it was a shock at first, but then I thought "hey, is that possible? it's way more comfortable!". So I took my pants off and the feeling was strange, but in a positive way. I was naked in a public place and.. nothing happened! It was a moment when I realised that you don't have to ALWAYS wear clothes, that you just have a choice.
Second story is about my first "real" naturistic experience. I was 24, studying in Warsaw. I've read about the nudist beach in the southern part of town. I went there with my good friend, because we were curious of how it feels to sunbath naked. Weather was just perfect, the beach over the river surrounded by forrest - like a fairytail. And so was the feeling - warm of the sun and touch of wind on my skin. I just felt in love and I realised that this is the way I want to be connected to nature, if you know what I mean.

Yeah, so I've confessed 😀