The Inbetweeners is pretty good, quite realistic (though some things are exaggerated for comedy's sake) and overall very funny. However, it's very rude and there is lots of cursing and talking about sex, alcohol, etc. throughout the entire show, which might put you off, I don't know.
Skins is also quite popular, although I've never watched it, and is about teenagers of the similar age bracket (16-18). It's a lot darker than The Inbetweeners and has a lot of heavier topics in it, and I can't speak to how realistic it is.
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Has difficulty understanding even short answers in this language.
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