Cutting, Self harm, energy transfer?

Hey,
When i feel overwhelmed, I have this distinct horrible feeling of heartbreak in my chest. I have a little pocket knife, that i hold up to my heart (as if to stab myself), and just hold it there and take deep breathes until the feeling or panic stops. It’s really weird sometimes the horrible feeling almost instantly goes away, or at least with in 5 minutes. As i hold it there i move it around to try to find the best spot on my heart, as it there’s a specific place the pain is coming from. I don’t have any real desire to cut myself, as i wouldn’t like the pain, blood, mess, possibility of infection, and it just wouldn’t work for me. I tried to look this up online, but i couldn’t find a thing. I almost wonder if it some strange type of energy transfer, as if the pain just needs a conductor to travel through out of my heart. Of course, then why would it need to be an open blade? So i know there’s an element of psychosomatic energy release, but i still wonder how much of it could possibly be negative energy actually leaving my body. I guess it’s probably not, but then i can’t understand why this works for me, why i have no desire to cut, and why i’ve never heard of anyone else doing this. I’m also pretty introspective, and intellectual, so it’s strange to me that i cant really identify where the feelign is coming from, and why it’s such an overwhelming physical feeling cause from emotion.
Anyone else do this?
Anyone ever heard anything about this?
Any thoughts on what it could mean.
Thanks, I appreciate it.
oh and im 22, and female
yeah, and anyone with some possible comparisons or actual knowledge in psychology would be appreciated.