Breathing problem, maybe asthma?

I'm 13 and fairly active. But lately I find if I overexert myself too much I can't breathe. It feels like I'm breathing through a straw and no matter how big a breath I take, it only goes a tiny bit down into my lungs. And I have no breath to exhale. It happened recently from a pretty easy exercise and I could hardly breathe for almost 10 minutes. Yet I can run 4 miles no sweat. My mom has asthma pretty bad, but I never thought I had it. Everyone says it would be unlikely. This problem has only happened maybe 5 times in the past two months, but it was pretty severe. Do you think I have asthma, or something else? Am I just not used to certain excercise? Thanks in advance.