I can wear a few different sizes, I am mostly around a 10 in mens however I have gotten up to 11 on more than one occasion and also down to 9 on more than one occasion. I don't even bother with womens shoes anymore since all of them expect you to have pencil thin feet in order to fit your feet into them, and nothing in the stores goes over size 10 and I am past a 12 in womens on some occasions. My whole family has large feet and since I am the youngest its only natural that I got bigger feet than the rest of my family. My cousin (not my immediate family) already wears a size 9 in womens and she is only 11 years old. My message to the shoe companies is to make larger sizes in womens shoes because they are losing out on my business and tons of other women's business because they do not manufacture shoes that are large enough for the size of today's American's feet. My feet are also massively wide and thick (not fat) which means they are not going into womens shoes no matter how much I try.
The only good thing about it is that no one really looks at your feet, at least where I live. I am lucky I can even fit into mens sandals (most are too narrow or too hard, it takes a while to find a decent pair) but at least no one seems to care that I wear them.