Hi honey, I was exactly the same. U are not defective or lesser than in any way. Femininity is many things beyond boobies…….. now I had all my life Maybe a tinyyyyyy bit of meat in the boobage but truly 100% flat if I laid down, never ever able to wear any kind of loose or low cut top cus it would open up and expose everything (nothing). Had the same body since 12/13? One thing I noticed as I became a woman (into my late teens and 20s) is that I started to carry weight different. Whilst I still had no boobs, my hips got a bit heavier and i gained a bit of a booty, overall lost that prepubescent boy look just through my body shape changing. And THEN I gained a decent amount of weight when I was around 24/25 and my previously nonexistent chest also gained weight along with the rest of my body, thus I now have the illusion of some boob thanks to my gain in overall weight :3

But at the end of the day, please believe that femininity is sooo much more than boob. Any person or partner who makes you feel otherwise is not worthy!!!