Hello
Thanks for the query.
Don't worry 
acne is a common problem in adolescent age group. 
It will decrease with age.
It is very important to know the cause of acne in order to approach it properly.
Following are the common causes.
1. Blocked  glands of face
2. Bacterial infection.
3. Excess  Oil production by glands.
4. Environmental pollution.
It is better to go for a combined approach to get rid of acne completely.
Please follow the following.
1. Use a combination of 
adapalene or other 
retinoid cream and 
clindamycin. This will take care of blockade as well as bacterial infection
2. Use a water based sunscreen with spf 30.
3. Use a drying face wash like tea tree oil.
4. Its best to keep face covered by cloth whenever possible to protect from dirt.
5. Don’t rupture or try to remove scabs from infected acne, This will lead to pigmentation and scar formation.
Don’t apply 
steroid creams, they give immediate relief but later cause damage.
Let me know if you have any other doubts.
Thank you.