My hand tends to shake while i'm holding something out, like to a person. even if i hand a paper my hand shakes should i be worry if i'm 19?

Familial tremor?: If this is coming on at your age, chances are you are among the 1% of humankind with benign familial tremor. Next time you're with your physician, have it checked. The treatment (propranolol is one option) may be more annoying than the non-disease itself. There are other possibilities as well, if it's disabling a neurology consult may be in order.