Do you think I have asthma?

I have just been doing High Jump. I did one jump and was out of breath. No one else was. I'm quite fit, do P.E at school, badminton once a week and most of the time I go gym once a week. I've always had this, even after I run or so any physical exercise. I would say I am pretty healthy, slim and eat well. Should I go and have an asthma test?