Why do I breathe weird when I exercise?

Ok so I was doing these squat type things and I notice when I don't breathe I breathe I know it's weird to get what I'm saying because I really can't explain it. I notice that it's weird so I stop myself from breathing but I still breathe but not normally but like from the back of my throat see yeah I can't explain it. like if I open my mouth and do crunches yet hold my breath I can feel air like at the very back of my throat and it's really load and it doesn't sound like breathing
If you know what I'm talking about what could it be