Try using a tissue, or any barrier, in between your hands and your face.

stick your hand inside a sleeve

Just make sure your hands are clean. Just so you know, its a proven fact that acne is mainly caused by hormones and change, not so much diet or touching your face. There are good antibiotics you can go on which can help your acne or even special prescribed creams.

You'll just grow out of it. I had really bad acne and actually a few skin problems that started in middle school and stuff and by like Sophomore or Junior year of high school I might of had only a few pimples each year though only when extremely stressed usually. I inherited dry skin and eczema and oily skin and acne at the same time.

Just scratch it. There's no need to be overly protective. As stated above, most of its hormones and such.