She is not necessarily preaching your problems, but whether your relationship with her is progressing in the same way.
We are not perfect, some small things are learned in life. If your girlfriend is right, try to adjust it. I believe you two will get along better.
I don't believe in a match made in heaven, and I don't believe in the kind of love that 100% fully appreciates the shortcomings that the other party can't see.
But I believe that men and women who can get along well after careful running-in will certainly go far.