There is not much you can do about saggy skin, you'll either have it or you won't. There are many many factor's that play into that - genetics, age (you're young that will help), how fast you gained, how fast you lost, etc. etc. There are a couple stickied threads around about the topic as well. There are also some lotions and creams, but most of those provide little results.
Building muscle will help, but you can't spot reduce and you can't sit up away saggy skin.
I wish I had better news for you. Don't worry about not seeing many results after only 10 lbs, that's normal.
For what it's worth, I've lost 120+ lbs and I'm 31 and my saggy skin isn't that bad. It's certainly coverable with cloths and I can wear tight fitting clothes without a problem. Fingers crossed for you.
268 lbs - Journey Begins (January 11, 2006)
197 lbs - 71 lbs lost (October 15, 2007)
247 lbs - 50 lbs gained pregnancy (August 22, 2008)
195 lbs - baby weight gone (July 7, 2009)
168 lbs - 100 lbs lost (March 26, 2010)
148 lbs - GOAL! 120 lbs lost (July 18, 2010)
138 lbs - 10 lbs under goal (December 29, 2010)
PR 1/2 Marathon - Time 1:59:50 (November 11, 2012)
PR Marathon - Time 4:40:53 (March 18, 2012)
Today 140s & training for my Health
"There is nothing you can't have tomorrow so there is no reason to eat it all today."