When my kids were that age I was shocked that all the values I taught flew out the door replaced by what the other kids did. I told them no one loves them like I do, no one wants them healthy, successful than I do, so why are you following those kids? Peer pressure is powerful.

I'd recommend getting him involved with other kids groups. Wholesome activities as well as home schooling. Peer pressure really sucks esp in those with low self esteem.

I had a friend whose son just starting with drugs with his friends. I gave the mom same advice. She got him involved in dancing. He eventually felt so good about himself, gave up those friends and the drugs. He was confident, took better care of himself and his classes.