I think I might have heartburn? Help?

Ok I've been having pain in my chest for quite some time. Kind of like tightening. It's in the middle of my chest right where my heart is. I don't know if it's heartburn but I don't know what else to call it. Any medical professions who can help? I'm 17, 5'2, and 170lbs by the way. Could it be cz I'm overweight.
I think I might have heartburn? Help?
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