Ever since I was very young, my chest hurts at random times when i breath in. The deeper, the worse.?

I have experienced the same thing since I was about ten and I'm 35 now. The deeper I breathe the more it hurts and it's also on the left side sometimes near my heart. What I do to make it go away is I exhale Then count to three and breathe in super fast and deep kinda like when someone jumps out at you and you're surprised. I usually feel a popping sensation and it's gone. I went to the doctor and he said that it was just heartburn, hope he's right but even so I've experienced for the past twenty five years and it's more of an irritation than anything. I suggest you talk to a doctor if you're really concerned about it:)