Chances of a 19 year old getting throat cancer just wondering?

Social habits like smoking and use of chewing tobacco will greatly increase the incidence of oral, pharyngeal, and lung cancer, even in young adults. Alcohol use and HPV also increase risk. Chances are very small at your age, but still possible. more info here: https://www.mskcc.org/cancer-care/types/throat/throat-cancer-risk-factors-prevention

Risk is virtually nil. A rare cause is Epstein Barr virus induced cancer, however even that is extremely rare in the US. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV, Flu and Covid vaccines. Wish you good health!