Acne are very easily treated at your age with a few precautions and simple treatment
Start with applying clindamycin along with adaplene combination in the day and also benzoyl peroxide cream in the night.
Doxycycline 100 mg two times a day is really helpful along with it.
Precautions I will mention in the health tips
Just keep in mind acne is a problem which will happen over and over again it doesn't have a permanent cure, what best we can do is treat the same for the time being and keep precautions so the tendency of the same decreases.
Next Steps
Start with the above mentioned treatment as soon as possible
Health Tips
Avoid oily food
No application of hair oil of any sorts, if u wish to apply hair oil only do the same before bath and then wash.
No cosmetics to be applied for the time