How to get fit, get skinny, and lose fat as a teenager
Before anything rule out pregnancy . Second take up non competitive bodybuilding and get a physically demanding job after school then google Dave Ramsey and get on his program.
The most effective way to burn fat off is WORK - you are active longer per day than exercise in a gym, plus get a pay check.
Try long term non competitive bodybuilding, eat healthy, keep total calories and activity levels and workout cycles - within middle of the road for you and only eat what agrees with you. The physique will take care of it's self over time.
ectomorph - naturally very lean has trouble keeping weight up (including muscle too )
mesomorph - naturally muscular relatively lean .
endomorph - holds onto and builds muscle but holds onto and stores body fat predominately . Most folks are a mix of the three.
Food plays a vital part of health and keeping lean - and WHAT is eaten is as important as HOW MUCH and WHEN and HOW OFTEN.