Why am I so shy around them? How can I be more confident?

well its the exct thing with me i even go to a girl school with a boys skl next to it n when im around peeps i dunno im the same i get embarressed because i think theyll cool n they no everyone and woul never tlk to me but never act lonely around them if they ever look at u smile and maybe if you see someone who looks a bit like your kind or freind you should tlk to her when u can and then if she tlks back keep tlkin n make jokes in the end ull b freinds n she will introduce her freinds and so on youll be fine because youll then no everyone or some people and youll be confident just b urself i no hw u feel ive moved so many times but in the end im always popular xx