from here

• Smile. Not only will it brighten your day, but it will make other around you smile too
• At the end of each day write down something you think you did well. (E.g: I stood up for a girl who was being bullied in class today)
• Listen to songs that make you happy, not ones that make you want to shut yourself off from the world and cry all by yourself in your room
• Believe that you're in a confidence bubble. Kind of like, you're wearing and invisibility coat
• Love what you wear. When you look good it changes the way you feel. This will make you confident with presentencing yourself to society
• Walk with purpose. Walk like you have got somewhere to be
• Make eye contact with the person you're talking to or are talking
• Next time you're at a party meet someone new. The girl by herself in the corner looks like a good person to start with
• Clear out the clutter in your life. A messy room equals a messy mind
• Stop comparing youself to others. Focusing on your positive qualities, rather than comparing yourself to others, is a great way to boost self-confidence