Shower

I had a shower with my boyfriend for the first time yesterday and I felt quite uncomfortable during it bc the whole time I was just covering and holding my boobs bc they are so saggy so I’m so insecure about them, especially bc I’m 18 and most 18 year olds have perky boobs☹️ i also only let him see them if I’m lying down bc it’s the only way I feel ok and I always wear a bra around him. How can I feel better and more confident about them around him😔