First u should be confident about that cuz your not that older to be afraid to go to school only bcz of a pimple.But anyways you should take care of your face ,and i have some advice.
1-Avoid touching pimples and face
2-When you want to apply cream or something else on face you shoul always have your hands clean ."Never touch face with dirty hands especialy pimples.
3-Clean your face with cold water in morning and at night with warm water.
4-Keep your pillowcase always clean ,bcz it contain lots of bacterias etc
5-To get rid of a pimple in short time you should apply ice on your face, But you should wrap the ice with a cloth cuz this keeps your face more protected.
6-And also for a better result you should buy pimple patches.
Hope this will help you 😇😇😇