How much is my cleft affecting my athletic ability?

I don’t know where else to ask this, Google wasn’t very helpful. Because of my cleft, I can pretty much only breathe out of one nostril until I get the rhinoplasty. I’m wondering if this is affecting my ability to perform athletically, because it feels like I have absolutely pitiful stamina compared to my peers. I have to take constant breaks to just collect myself, which is annoying since I feel like I’m in decent shape physically.

If anybody has some information about this I would love to know. It’s sort of getting me down.