I am 16 my chest feels compressed and i have constant cold feeling in the centre of my chest, it feels quite deep. It feels like my lungs have shrunk also. I am healthy and play a lot of sport and recently when i breathe in  when playing it also feels really cold.
Thanks for your question on Chat Doctor. I can understand your concern. Since you are young (16 years), playing sports and living active life, no need to worry about major lung or heart related diseases for your symptoms. Sometimes in teenage, stress and anxiety are common. And these can cause similar kind of symptoms. So better to consult psychiatrist and get done counselling sessions. Try to identify stressor in your life and start working on its solution. You may need anxiolytic Chat Doctor.  Don't worry, you will be alright. Avoid stress and tension, be relaxed and calm. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.