I don't think she was trying to make you feel bad. She probably just didn't think about the fact that calling something much bigger than you "good size" makes it sound like you're not a good size. She's used to bigger guys but if she hasn't been completely satisfied so far and still been with you for a year obviously there's other ways you make her happy that make up for it.

Also, I noticed you said that she does have orgasms with you if you use a toy on her clit so i'd suggest getting cock rings that vibrate and have ticklers to stimulate her clit but still have your cock as the main source of pleasure rather than replacing it with a vibrator or cucumber.