How Can I Stop Regrets From Overwhelming Me?

I see a young woman at the pool, and as soon as she gets out of the water, she pulls a towel around her - ashamed of God-knows-what imperfection.  Maybe she thinks her butt is a little too big, or her legs are a little too short, or her waist is a little too thick.

And I want to slap (metaphorically, of course) her! She looks great!  If I were her I'd be strutting it - but then i remember, I was that young woman and I also pulled the towel around me, failing to measure up to some imagined and wished for perfection.

But wait - what do I do NOW that my future self would look back on and say - What are you DOING????