Sometimes people feel like they are getting too much or not enough air either coming in or when they exhale. This may be a temporary sensation, or may mean that the pressure settings need to be adjusted. There could also be another medical problem that needs to be addressed.
It might help using a machine with a "ramp" feature. This allows you to start with low air pressure. The machine then automatically and slowly increases the air pressure to your prescribed setting as you fall asleep. Your doctor can adjust its rate.
If, after trying this for a couple of weeks, you still can’t get used to the air pressure, you may want to contact your sleep doctor about rechecking the pressure settings and consider alternative