
Oh, I so understand.
I just turned 23 and had an armlift 6mos ago because after the weight loss my arms were HORRIBLE. Uck. The scar is much preferable. It is thin-- less than half a pinky finger width, but it is red/pink. That will go away, I'm told within another year or so.
I ALWAYS had big arms--- and HATED them. They would jiggle and wiggle even when just typing on the keyboard. So embarrasing at school!
But--- it can be taken care of with an armlift. Maybe your skin will shrink up on its own, but to be honest, I would doubt it. For just the reasons you listed. Being so heavy for so long takes an irreperable toll on your skin.
But, chin up! You have done SO well, you will continue to do well! It is NOT your fault that your arms aren't shrinking up. You can't change the past, only the future and you are doing what you can to take the weight off.