What are the chances of me having a heart attack?

I'm a 19 year old female. I weight 180 and 5'8''. No family history of young heart attacks. No high blood pressure or high cholesterol.
I smoke and drink everyonce in awhile. I have acid relfux. I worry so much i have panic attack. Will you help me please get it out of my head. If it is all in my head.