Low libido, abdominal fat gain, loss of body hair, causes? anything i can do about low testosterone?

Yes, lose weight: Testosterone is a fat soluble hormone. When you lose weight, your blood levels of testosterone will increase so get on a healthy diet and exercise and watch energy return. Also be evaluated for polycystic ovary disease which may be a cause and is not uncommon in young women experiencing your symptoms.

You need a check up: See your doctor for a physical exam. There may be a hormonal problem. Are you physically active? Is obesity an issue? There could be a thyroid disorder. This could be simple obesity and deconditioning. You need an exam and laboratory tests.