ETA I did not start this thread. The person who did seems to have deleted their message.
You're young. Don't worry about this right now.
I was overweight/obese most of my life. I had 2 big pregnancies. I have loose skin, sure... but it's easily hidden. I sure as heck am not as concerned with a little bit of skin as I was with carrying around 100+ extra pounds.
Time helps, as well. I've been 'healthy' weight for over a year now. My skin has improved dramatically in that time. When I first lost the weight, I was worried I'd look like an empty bag forever. That has not been the case, at all, for me.