You need to go to hospital as soon as possible. Your arm won't mend itself and it must be painful. Also your arm will need setting again in its proper position otherwise it will set deformed and you will need to have it re broken in order for it to be set correctly.
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Um, I suggest taking it to a doctor to have it X-Rayed or something. If you can't, wrap it up using a splint like a pencil or something straight to keep it from healing strangely.