Your number one enemy is fabric. Oversized hoodies are comfortable, but they turn a very little teen into a floating head. Look for "cropped" fits. A cropped sweater that hits at your natural waist elongates your legs. Avoid tunic tops or long-line t-shirts that end mid-thigh; they shrink your legs by 40%.
You are not alone. Millions of teens struggle with being perceived as younger than they are, dealing with sleeves that hang past their knuckles, and jeans that bunch up at the ankles. But being a "very little teen" isn't a curse; it is a specific silhouette with advantages that the fashion industry is finally starting to recognize. very little teen