Struggling with acne

I've had acne since I was about 11 and I'm almost 15 and I still struggle with it really bad. Sometimes it can calm down but I still have really bad scaring from it but other times such as now it can be big, red and kinda painful. It really brings down my self esteem so I've tried so many things to try and get rid of it but nothing seams to work. Does anyone know any amazing products or ideas and ways that can help it?