I have one 40cm birkin right now--a brique clemence with ghw, I love it and I get compliments on it. Because it is clemence, the feel is less structured than some other birkins. Very flexible and squooshy.....
I used to be 5'6" and have dropped with age (!) to 5'5" This is not and will never be my everyday bag. I take it to events where I have to tote tons of paperwork and things. And it is my go-to bag for every trip I take. I love it because it is flexible enough to put under the seat or in the overhead.
A more structured stiff leather would create a bigger "look" in my opinion.
But while it might be tough to carry off, you have to think about what you need and what you love. Listen to the perspectives here. But in the end, think less about how it makes you look and more about whether it is what you need and what you love. Heels and a killer attitude will get a shorter person a long way.....