Stress can affect more than just your physical health. Mentally, it causes you to crumble. You lose hope, faith, trust & peace. Inner peace can only be achieved by remembering the Almighty frequently; asking for His help & forgiveness; not just in times of difficulty.
Choose your friends wisely. Be in the company of mature people. Those who admit they're wrong. Those who don't blame others for their mistakes. Those who take responsibility for their actions. These are people who will help you grow.