[header] How to make friends in school when you are extremely shy [title] Smile at others. [step] Smiling is the most important thing you can do to look friendly and approachable. When you catch someone's eye or someone talks to you, smile-it lets the person know that you're glad to interact, even if you don't know what to say. 
[substeps] You don't have to walk around wearing a grin all the time because that would be unnatural. Just practice keeping an open, pleasant expression on your face most of the time.