Hi-
I got my CPAP about two weeks after my sleep study. Getting used to it IS a bit of a process. I found that wearing it while watching tv (without trying to sleep) helped me get used to the feeling of having it on and breathing through it. That way you are not lying there at night with the pressure of feeling like you HAVE to sleep with a new strange set up.
Also, don't be afraid to try lots of different styles of masks, there are a ton of them and one is bound to feel most comfortable for you. My provider allowed me to return any mask I tried as long as it was under 30 days to exchange for a new one. Many online retailers are also this way, check around. Also, it sounds counter intuitive. but avoid over tightening the mask on your face. It should not be loose, but over tightening makes it both uncomfortable to wear and actually MORE prone to air leaking. Hard to explain, but true.
I know you are frustrated by this hurdle (which is totally understandable!), but try to see the good in this too. Sleep apnea really IS a serious health issue. It doesn't matter if you feel "fine" when you sleep without treatment or not. Damage IS being done. You have now discovered the problem and you have a chance to adresss it not only before your surgery, but during your weightloss journey. I guarantee you NOTHING will make losing weight harder (surgery or not) than the lack of real healthy sleep that untreated sleep apnea causes. The connection between poor sleep and obesity is well documented.
All surgeons are different in what they require as far as compliance with using your CPAP. Mine required a 30 day printout from my sleep doctor to show at least a 4 hour usage every night.
Again, I know it is frustrating and overwhelming. (((Hugs))) Tell yourself you are going to follow this part of your journey to give yourself the very best shot at health- and when you get to that surgery day you will know you are prepared and ready to give it your all. I will be rooting for you!!! 💙