Felt insecure after saw my gf's dildo

Recently I have been walking around and I saw a dildo in my gf's wardrobe it was so big like fucking big. After seeing that I got alittle bit insecure about my dick. I have a good 7 inch dick but her dildo was very much bigger than that When we had sex she said it's big enough but still she had dildo in her wardrobe. Is it normal for girls to have dildo or she is not satisfied with the size of my dick? Tell if anyone know