I feel very weak in my body, mostly my legs are very weak and shake whenever i put pressure on them. why my body acts this way? i'm 18 female.

Muscle , nerve: Your nerves that go to the muscles could be malfunctioning. You could have metabolic imbalances with electrolytes. See your family, doc.

????: How long have you felt this way? When was your last medical complete physical ? Do you have extra heavy periods and could be anemic ? Are you very sad? Are you able to sleep at night enough hours? How is your appetite for healthy foods? Sounds like you need to talk to the doctor . Weakness in the legs can be serious