Is having low blood pressure at 19 bad? i get extremely light headed & dizzy. when i feel like it's lower i feel sicker. i eat good and drink fluids.

Yes: You have symptoms associated with the low blood pressure. Good to hear you are drinking plenty of water and eating a balanced diet. I would see your MD for an orthostatic blood pressure test and if it's positive consider seeing a Cardiologist for a tilt table test. Sometimes people with low blood pressure with symptoms may require medication to stabilize it.