When my kids were your age and suffering as you are this is what I suggested for them. My daughter's skin was bad. I did not interfere until they asked for help, I must admit I had to bite my tongue hard! Anyway, for Samantha & Gordon I got Optima Tea Tree Oil and Organic Tea Tree soothing antiseptic cream 1 for each of them.
Every evening before bed I suggested that they use each use
3 drops of Tea Tree oil in 1 pint of warm water, soak their own facecloth in the water, gently squeeze but keep quite a lot of moisture in the facecloth & place it on their face for a while, gently pressing it so that a little moisture flowed on their faces. After around 10 mins they would rinse their face with cool water. Use a clean towel to pat dry their faces.
Wash their hands thoroughly and apply the Tea Tree antiseptic cream on any acne spot using a clean cottonwool bud for each application.
It took them one month but it was worth it because after that as soon as a spot appeared they knew exactly what to do. Remember to use clean face cloths, towels, cottonwool buds and above all CLEAN HANDS. If you touch a spot and don't wash your hands immediately you will contaminate another part of your face.
It is tedious but worth it I promise you.
Incidentally my granddaughter is suffering now but she is using the Monsia Acne Treatment System, her acne is very mild and she thinks this will work for her. She only started a couple of weeks ago and it seems to be working but she is also washing her face with the Tea Tree oil with water they way her mum did who incidentally did not offer advice until asked.