hi pal,
all i can say is HANG IN THERE:angel: .
I know how you feel exactly right now. I've been battling acne for almost 10 years. Now I'm 25 and acne still following me. When I was at your age, I have severe acne too, but not my mouth but all over the face, especially side nose. It get soooo damn painful that i can't even make a facial expression. I remerabered I even pretend to be sick and not going to school coz i was too erabarrassed with my condition. At high school, I was remerabered as an ANGRY outcast, not becoz i always angry but i look fierce without any emotion on my face. I can't laugh, can't squick, can't do any facial expression at all coz it's pain like hell.
The worst part is, all of my frienRAB have perfect skin and even worse, they never take care of their skin yet they have the most beautiful skin i ever saw. It just makes me feel frustrated and unfair!!:blob_fire
enough grurabling.

anyway, i think it's best to have a short hair or if you really wanna keep long hair, then make sure the hair doesn't touch your face like what other people have been mentioning. Other than that, ask your derm about the prescription and stuff, give it some times (months) for the effects to kick it. What has been done already has, even if you feel really pissed but still the acne around your mouth won't go away by the next minute, it will probably take a few days to weeks (depenRAB on what anti-acne regimen you are currently using) for those "monsters" to go away. Stay calm and be patient, explain to your parents that acne has been bothering you, i'm sure they are more than willing to help you.
I know it's easier said than done, but trust me it will get better. what you've been thru today, i (or more people on this board) had already been thru it years ago, so HANG ON. Anyway, ACNE SUCKS BIG TIME, I know.