Do i have asthma or hiatul hernia, also is there anyone with the same symptoms?

I'm 15 year old active girl.! I'm 5'10 and about 145 lbs.! I'm having difficulty breathing for example I'll play for about 1minute in my basketball game and I'll be extremly tired I'll have heavy breathing and a sore throat. Another thing is I get extremley tired from walking up the school stairs. The reason I thought of hiatal hernia is because I have a weird clicking in my chest(sternum).! If you have any answers help plz.!