Perhsos you can not control these thoughts but you can learn to live with them.

Think of a large family or neighborhood party. No doubt there are people at the party that you would prefer not be there. Does that mean you should leave the party? Or should you ignore the unpleasant ones and enjoy the party anyways?

Perhaps you can accept these thoughts as annoying, time-limited vestiges if your childhood and move forward anyways, despite the thoughts, in your relationship with your girlfriend.