Would u say this is a good beginning to a story?

I'm 15 too and I write a little myself, the first thing that jumps out at me is you over use "as". I'd switch "I remember watching her kick her legs back and forth in the water where I could barely see her toes AS they wriggled around" to "I remember watching her kick her legs back and forth in the water where I could barely see her toes WHILE they wriggled around" and go through the page again with this in mind, great start though.