get used to it and it will just become part of your going to sleep routine. It will take time though, so hang in there.
Lot's to get used to. For me the main thing is making sure the mask is on properly and leak free. You'll work out how tight to have it etc. in time too.
Your boyfriend has to get used to it too. However, he needs to know you have to use the xPAP and if you don't it will seriously affect your health. I suppose his main issue would be noise from the machine, but earplugs are very cheap.
Keep on trying and it will work out. I expect everyone on this site has gone through the same problems and had to work through them, and can tell you similar stories from when they were newbs