Hello, I'm 22 years old.
Ever since (estimate) 2002 I've had minor chest pains. I will try to describe them best as I can.
All I can say is I have them now and then. Some just start like that. Some, when I take a deep'ish breath I get a pain, and can't take deep breaths till it goes.
It seems lying down helps the pain.
However early last year (I think) I had the worst experiance. The tight clenching in the chest feeling. I had to lay down on the floor which seemed to help and it eventually went.
On a side note, I don't wear bras, but I highly doubt this is the cause.
I'm so sorry for being vague, if there's any questions you could ask me to open my mind up please do!