A lot of people can get used to it. I actually can't sleep without it now, and I use the full face model. It's almost comforting now. That said, some people truly cannot get used to a full face mask. If it's an option, they do make nasal masks (only covers your nose) and nasal pillows (kind of just rests under your nose.)

I've heard there are even more cutting edge options out there but I never looked into them since I'm fine with what I have, but it's definitely worth doing some research about. Quality sleep really can be life changing if it's achievable.