Yeah, I walk funny too.
I slouched when I was a kid [who didn't, though?] but then in high school I started holding my shoulders lower, and I didn't realize I was doing anything unusual until an honest friend [bless those people] told me what I was doing, then I moved onto overcorrecting like I was in the military, and now I've sort of moderated that [trying to keep my spine straight but not putting the shoulders back] after getting mocked by a guy who walks like an ape but was nonetheless accurate in his criticism.
I also have trouble with walking into stuff, like when I'm trying to go past a chair or something I'll mis-calculate how far away from it my path needs to be and bump into it or have to somewhat contort myself to avoid hitting this object [or person, occasionally, but I tend to give them a wide berth because I can't stand non-intimate people being too close to me and I can't help but think that they feel the same way.]
I also usually have to pay attention when I'm walking next to someone, or I'll just sort of drift right into them without realizing it.