Please check with your doctor. Anytime you have a change in your health (pain, breathing problems for example) it's best to have it checked. Generally young people are pretty healthy but things can go wrong. Hope you get some good news. I've had heart arrhythmias all my life, even as a very young child, but I'm still kicking at 59. Not every heart problem is dangerous.
I agree, true heart related chest pain would be extremely rare for someone in your age group. Your symptoms could be anything from simply growing pain , especially in light of the age when this pain started, to something like asthma which could cause you to be short of breath. Have your parents take you to the doctor.
I don't think it's anything serious, it would be extremely unlikely to be anything concerning your heart at your age. You need to discuss this with your parents and have them set up an appointment with your family doctor to be safe.