Please answer soon, I promise 10 points, am I okay?

am 13 years old, a female, eat very healthy and exercise. I am 5'6'' and weigh approximately 118 pounds. Over the past while, I've been noticing some pain in my chest and feel like I am short of breath. I also have had a small headache. I am not showing any other signs of asthma, and my mom just says it is from basketball. Am I okay, could this be serious? Usually when I get it it is at night. Could it be because I'm tired. I could go to the doctor, but I feel like they'll just call me a hypocondryact and give me an asthma treatment, which would not hlp, I don't think I have asthma, or maybe I do; I don't know. I don't know what to do. Help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!…