Someone gave me a baby turtle. I'm not sure if they have been taking care of it. I need to know if it's a male or female?

[![Turtle Sleeping][1]][1]

Also, when I placed it in water it just floated. So I took it out and layed it on the dock and it's sleeping with it's legs sticking up, lol. Any concerns? 


  [1]: https://i.sstatic.net/YWRYv.jpg