If im in a band, and im 13, where can we play? We're all between 12-15, and most people recommend starting in pubs, but thats obviously not an option.
School? Ask if you can play at a school show or if you could throw a gig in a suitable space, which schools often have.
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*note that by fan i mean that guy who wants his friends to know he knows this totally obscure hip band that only he knows about with 236 views on youtube. lookin' at Kev here
School is your best bet - also, any outdoor local events ( festivals, etc.). One thing we did back in high school and junior high was to simply organize a gig at the school - and have it happen there - find another band and make a night out of it.