Insecure about my small boobs

So I have quite small boobs (32b) and I’m very long and lanky haha (5’10 and skinny) and I feel insecure about it. I never used to feel like this but I feel like society’s beauty ideals are changing and looking like Kylie Jenner is more desired than looking like Kendall Jenner if that makes any sense. My bf used to watch porn but it upset me so he stopped and hasn’t watched in almost a year. He always tells me that he thinks I’m the most beautiful girl in the world and blah blah blah but I can’t help but think about him wishing I had bigger boobs. He’s never said ghat but it just goes through my head constantly. I’ve decided to try to grow my butt with exercise but there isn’t much I can do for my boobs (besides plastic surgery which is not an option) so I’m just trying really hard to love that part of myself!! Is anyone has any words of wisdom I would appreciate any advice!!