How can I know if I'll have extra skin after weight loss?

Guy15
Hi, I'm 15 and around 240 lbs... I don't look overweight because of my height. And I'm ashamed of being that heavy. My goal is to lose at least 40 lbs this year. I'm starting to exercising a lot more than I used to. And I'm eating healthier. But I've always been paranoid of this one thing. I'm worried about having a lot of extra skin left afterwards. I don't have a lot of stretch marks but I'm still worried. I'm only doing this to both feel and look better. But I'm really worried about that one thing. I know you might say surgery. But my family doesn't have that kind of money for things like that. How will I know if I'll have any excess sling left over? And if I can, how can I prevent having any excess skin?
How can I know if I'll have extra skin after weight loss?
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