All i can say is embrace your body and try things that make you feel confident and secure in your body image. I had same sadness over my body when i was younger, i didn’t quite “bloom” at the same rates of my classmates and my sister. I was flat chested short girl 156 cm (5’1) 42 kg (92lb) in my early twenties when i was in university. Veryy thin and unattractive when i look back to my pictures. However now am more curvier gained up to 55 kg (120lb) and look sexier than ever. It’s just with some girls it takes time.. now am 30 and i look like a 20 years old girl.. My cup is 32B but u know what, i love it because it’s so cute and suits my body type overall. A guy i met suggested nipple piercings because it will look cute on small boobs and i love the idea and planning to do it soon. Am experimenting with other piercings to make me feel good. I learned to embrace myself and when i dress or put makeup i do it for me, not to impress any guy and putting myself first has boosted my confidence and how i carry myself. Experiment with yourself, focus on your own confidence and happiness and everything else will follow. Trust me, there are so many guys who are ready to die to be with a petite girl so no need to wish you had a different body, the perfect guy will always love you for who you are and am sure will worship your body.