You are 20 years old.

According to the Social Security Adminstration, if you are male you have about a .1% chance of dying in the next year, but you will probably live another 57 years.

If you are female, you'll probably live a little longer: 57 more years. There is still about a .1% chance you'll die in the next year though.

Anyway, you probably have about 30% of your life left. Have fun.