I would like to know if my current weight is healthy and normal. I am a 21 year old male who is 6 ft 4 in. And weigh 161 lbs.?

Yes. Your bmi = 19.6 which places you in the normal range.
Normal. You weight is in the normal range.
Have a healthy diet, exercise, drink plenty of water, have safe sex, and get HPV vaccine. Wish you good health!
Nutrition: http://www.choosemyplate.gov/.
Check BMI . Use a BMI calculator to know. SEE: https://www.nhlbi.nih.gov/health/educational/lose_wt/BMI/bmicalc.htm. BMI Categories:
Underweight = <18.5 * Normal weight = 18.5–24.9 * Overweight = 25–29.9 * Obesity = BMI of 30 or greater. By checking your BMI you can get an idea of whether you are in a healthy range.