My body felt OK when I was six or seven. I was really good at cartwheels, backflips and doing stuff on a bar/trapeze. But my mum put me on my first diet at three and then, at 8yo, my ballet teacher told me I couldn't enter the test as I was a fairy elephant. Or, at least that's what my mum relayed :(
At 14-15 I was in a pre-olympic diving team (flipping again!) but didn't associate what I did with my own body - I still thought of myself as fat. I had a diving accident, then developed anorexia. I still didn't feel good about my body; by then, I'd also acquired a fear of body hair that was to last until my fifties.
In my twenties - having sent genuine model scouts away with a barrage of abuse, assuming they were taking the piss! - my lovely boss, Jan, gave me a copy of Susie Orbach's "Fat Is A Feminist Issue". I recognised what Orbach was saying, did what the book recommended, and fixed my eating disorders.
Through my thirties, not longer disordered in that respect, I got on with my brilliant career and my not-so-brilliant personal life, never thinking about my body as anything other than a superbly useful part of me. When Marriage #1 broke up, my best friend said "Well, you have gained a lot of weight."
I pointed out that I'd previously been underweight. But what she said sank in anyway, but I wouldn't diet any more ... so I developed an exercise addiction instead.
Late thirties to late forties, Marriage #2 came and went traumatically, but the gym remained my friend. I worked out at least six times a week, often ten or twelve. I was very happy with my body! But this wasn't about feeling comfortable with my own skin (and muscle, ligament, fat, etc) - it was about controlling it, just like the anorexia. I said all the right things, but really I wasn't happy being my self; I was matching my body to a series of targets, ticking off boxes that meant "one less point of inadequacy". Gyms encourage this.
Eventually I broke. All that performance, all that control, couldn't hold in the turmoil inside of me and, sufficiently triggered, it all gave way. I became so ill that I couldn't walk to the street corner without holding on to garden walls & fences. I lost control of my bodily functions - it rebelled completely. I don't blame it.
I'm still recovering. I got the message. I work at loving my body: all its squishy curves, wrinkles and sags, and calluses and hairs; all its softness, resilience, sheen, healing powers, and what it actually does. It's fucking amazing! And so is yours.
I'm nearly as comfortable in my self as I was at six or seven - not quite, because I still can't cartwheel or handstand. But I'm no longer 6 years old: I'm looking towards the end of life, not the beginning; I'm experienced, have seen wonders and felt despair; I'm becoming comfortable with ME and my body is neither "me" nor "not-me". It's not a shell, it's who I am and there's much more to me besides :)
Fat Is A Feminist Issue still reads a little old-fashioned, although it's been updated. Even so - the more threads I read on forums, the more convinced I become that women really need to read it!