Don't give your mind permission to get disturbed. A disturbed mind is easily influenced. This will cost you your peace. Learn to maintain your peace by freeing yourself from attachments. Competing or comparing yourself with others will not allow you to focus inwards. An inner focus allows you to keep your eye on your higher self. Remember your original nature. It allows you to forge a link with the Divine. Then it becomes easy to recognise useless thoughts and replace them with a spiritual perspective. A calm mind is not just peaceful, it is focused, self-directing and Divine.