You are a 13 year old girl your blood sugar reading runs anywhere from 105-140 is that normal?

In most humans this varies from about 80 mg/dl to perhaps 110 mg/dl (3.9 to 6.0 m mol/litre) except shortly after eating when the blood glucose level rises temporarily (up to maybe 140 mg/dl or a bit more in non-diabetics). That is normal .