I'm usually not hungry. But when I am hungry I get full really easy. Like I can fill up on just half a sandwich. I'll be 14 in February, I'm 4ft 9, and 65 lbs.I've never been overweight or done a crash diet or anything, and I've been twiggy for as long as I can remember. What's wrong with me?
Your definitely underweight for someone for your size. However, a doctor examination is needed here as there could be a multitude reasons including something simple such as stress.
Ultimately, talk to parents about seeing a doctor to confirm any medical reasons and then move on to the possibility that stress is the cause of the loss of appetite.
Then again nothing could be wrong with you. It might be just a simple thing such as forcing more food down your throat even if your not hungry. It sounds strange, but, typically this is how you bulk up.