Have you considered a sex therapist? Sometimes they are better at hearing clues as to what the problem is since they have experience talking to a lot of couples.
It doesn’t have to be the kind you get naked in front of either, just an intimacy therapist that you can both safely describe your experiences to.
Primary schooling was one of the worse experiences in my life, and I was lucky enough to go to private schools with good educational programs. Other than incarceration, it is one of the only times in your life that you are legally detained somewhere against your will.
Furthermore, the things we choose to teach are so far removed from practical life skills that it all feels like a performance that is leading to a brick wall in the end. The fact that there is no standard class for budgeting, cooking, taxes, job hunting, and basic home repair in school really shows how much they actually care about your future success.
School in America is a time suck for kids so their parents can work longer.