Hi I’ve had acne since I was in 5th

Patient: Hi. I’ve had acne since I was in 5th grade only on my forehead.but it cleared up completely, then highschool I started getting it on my cheek bones& it bad new pimple everyday I have scars too , aslo get it on my arms , chest and back. I’m 19 now why do I still have it why hasn’t it gone away , I’ve used the new age medicine Proactiv cleared me up , but when the supply is gone my acne comes back , I need help, I feel so insecure, low self esteem, and stress because of it and stress can cause it.