Peer pressure isn't intrinsically bad, it can influence people to be good citizens, or to keep up their properties and build up neighborhood pride. Often, however, it seems to produce conformity around less than important issues, like dress codes or musical taste, and sometimes encourages anti-social behaviors like cruelty, drug use or sexual promiscuity.
The best moral compass comes from internalized values and from conscience, the kind the early disciples preached about when they began telling the world about Jesus' resurrection. When warned by temple officials they had been warned not to preach about Jesus of Nazareth, the disciples replied, "We must obey God rather than men."
Such courage can be ours with prayer.