Hi I'm 17 and usually well , so I've recently been experiencing pains in my chest that come and go it's like a tight sharp pain that comes every so often and I've recently noticed my left collarbone has become tender whenever I touch it and it has ached a little bit. I don't think there is any lumps on my collarbone nor does it appear swollen ( I don't think ) I am just slightly worried because I haven't been Injured and haven't slept on it funny , I'm just worried about what it could be that has caused this pain , thank you .