Replying to Twin tip skis size... did I choose the right size?

I recently ordered Surface Next Time skis at the 145cm length... did I choose the correct length?
I am a beginner but I'm progressing pretty quickly, the beginner slopes are getting pretty easy and I've been skiing twice in my whole life.
The thing is that these are youth skis but I'm not a kid, I'm 19 haha.
I weigh 122lbs and am 5'3 (unfortunately)... I chose 145cm because of the whole height thing and the height of it is just around my nose. And I found that a lot of the "adult" skis are too tall for me when sizing using this height method.

I was reading a post and a guy said that adults should seldom be on kids skis... but the problem is that I'm the size of a kid! Haha So just want to know will these skis workout for me even though I'm not youth?? I hope they well seeing that I already bought them!

And do I now have to get youth bindings as well? If so, do youth bindings fit Mens size boots?

Thanks for all the help!

Here are the skis:
http://www.evo.com/skis/surface-next-time-youth-2011.aspx#color=34145.Image.1.jpg