why does when i breathe in a sharp pain comes across my chest/heart.?

um,sometimes i will get this sharp pain in my heart/lung area.
and it will cause me not to breathe in deeply because it hurts or even sit upright. it will litterally cause a sharp poking pain in my heart....
any idea what this is and why it is happening?
i have one right now,and this is the longest its ever lasted.about 10 minutes now...
thanks:)
im 15 and a girl.
 
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