Will this skin sag after weightloss? (pics)
 

***contains pictures of me, without a shirt on. you've been warned! lol man i'm pale...***

I'm 5'8", 174lbs, 22 years old, and i've already lost 38 pounds to date. I gradually got pretty heavy, over years at a time through high school, i've never had a baby. so these marks on my tummy are just from weight. They don't seem that bad to me, when they first came in years ago, they were red and it scared me, i didn't know why i got them. but anyways.
I know some of you here have lost weight, and some people have saggy skin afterwards, some don't. I know the marks won't entirely disappear, they're almost invisible as it is, but i just wanted to get your opinion on if you think my tummy will be tight and firm after weight loss.
I am trying to do lots of resistance workouts, and i like how my stomach feels afterwards, more tight and in control.
Thank you guys for any advice! Here are the pictures. Let me know what you think! (i'm trying to lose 20+ more pounds)
Here's me just standing, i have kind of a dimple where my abs are pulling my tummy in ^^
http://i1203.photobucket.com/albums/...ookaWins/1.jpg
Here is me, from the side, flexing, and on the right, not flexing my abs.
http://i1203.photobucket.com/albums/...ookaWins/2.jpghttp://i1203.photobucket.com/albums/...ookaWins/3.jpg
Here is me, bending over and flexing, so you can get an idea of how much chubs there is. lol
http://i1203.photobucket.com/albums/...ookaWins/4.jpg
and here is a close up of the marks. (and a sparkle, apparently. lol)
http://i1203.photobucket.com/albums/...ookaWins/5.jpg

any advice is appreciated ^^;;