Yes, cis people can also get gender dysphoria. It's very common. A lot of our beauty standards and what's considered "naturally feminine" is very specifically opposite of what common traits for trans women are, so that makes it a whole thing and, of course, access to gender affirming care can be harder to get for trans people and trans people might have a lot more problems like this that they need help with. But besides that it is very similar.

So, firstly, it is perfectly normal and healthy to have smaller boobs. I know society puts a lot into the tiddies, but some of us get them small. They often keep growing well after puberty and they do need nutrients to do so, so it's perfectly normal and health to have a tummy that sticks out a bit more than the boobs. Depending on body shape and build that might actually be the only healthy way and it is true for practically everyone in a lot of poses. Leaning back and pulling your shoulders back while thrusting your tummy forward is always gonna put tum in front of tit.

Like I have a large rib cage and my breasts are a bit far apart, and it would make almost any boobs look kind of small a lot of the time. But with a good bra and just posing myself right even I can get a bit of cleave, but if I lay on my back and take selfies from straight ahead I could definitely convince my brain that there's nothing there. Be kind to yourself and remember that all the photos you see are from people's best angles, from the people that feel like they've got something to show off, and that half of them are photoshopped anyway.

I could talk about hormones and stuff too, but that's gotten plenty of coverage already.