I think that's the first snatch on turf I've ever seen.
See this thread that I just replied to - http://www.cathletics.com/forum/show...5629#post95629
Same thing going on - you're too far forward over the feet right away. When you break the bar, lift the chest and get back toward your heels. That will allow you to wait longer and stay over the bar - get it way up to upper thigh before you initiate your final explosion effort.
Also, you need to get the hips open more at the top, which will be possible/easier when you fix the pull to the hips.
Finally, pull under could be a bit better - really force the elbows out to the sides and up right away as you change directions - it takes you a little while to get into that position so you're losing a lot of initial acceleration downward.
But it's a really good start, especially for having no coaching! Good luck.