How to stop my hands in shaking...?

im 20.My hands shake involuntarily.it started when I drink slimming coffee. I don't know what to do.I get very embarrassed when this happens and focus more on my shaking hands rather than doing something. My hands especially shake when I am holding something in my hand or doing things.I am not a smoker nor am I taking any drugs and I don't see why this is happening. Please help me out!Once a day I hold my hands out in front of me to see how bad it is. They always shake a noticeable amount. Some days they get to the point where it freaks me out. Usually, putting them on my lap, between my legs or crossing my arms helps to steady them. I don't do any types of drugs, nor do i drink alcohol.which medicines should i take to cure this ailment?