Do you have a ramp setting?
This starts you out at a lesser pressure and hopefully you fall asleep by the time it is at full bore.
The thing about these things that makes them doubly hard to get used to in the beginning is:
After using for a couple of nights of actually getting a restful sleep, you are not your totally exhausted self when going to bed, and then you are trying to fall asleep with this thing on your head.
Try different masks, nasal pillows or whatever else that might be more comfortable for you.
There is also a Bi-Pap machine, talk to your Dr. about if one of these might be better for you.
In summary, I strongly encourage to keep using it,eventually it is second nature, it really improved my quality of life.
My woman cannot sleep if the Bi-Pap isn't blowing.
Ross