Once again reading stuff on the internet is NOT the gospel truth!
Please stop comparing yourself to others that post crap out there especially about sex, unless it's proven in a scientific journal, study or you've talked to your physician.
It's just too easy to believe what you read so please be skeptical.
Sorry.

Now when I started masturbating as a kid I only used prone position & I was hooked on it for over 20 yrs.
After seeing porn lol, realized most other women were doing it differently. So I started to experiment & teach myself other positions. Some I liked, others I didn't. It took a long time to get comfortable & I certainly didn't view it as a negative. It's only positive. I think about all the other women out there that don't know they can do it prone...& I have an advantage! Use positive self Talk & build your confidence.
You say you force yourself to close your eyes so you don't stare at the ceiling...yuck. That sounds boring!
Can you use some positive self talk to make it sound more appealing, sexy & something you wanto explore? Add some excitement to it. Relax & enjoy getting to know your body & the sensations it can cause by changing things up