I'm a slow walker!
For a number of reasons.
When I was in high school I walked slowly to school for mostly psychological reasons -- I hated it there because of the social issues I had, and I dreaded going so much that I was a chronic dodger. When I did have to go I couldn't bring myself to walk fast. A classmate who was a fast walker laughed at me for it and she got me thinking, yeah, I guess I walk slower than she does because she LOVED her social situation in school and couldn't wait to get to a new school day, while I hated it and just wished I could be back at home alone doing my own thing.
These days I'm a slow walker for two reasons:
When walking for recreation I'm usually heading to a forest park, and I like to look at my surroundings, take things in, see what birds I can spot flying around, listen to the breeze in the trees.
When walking for practical purposes to and from a destination, I physically hurt. I'm physically tired all the time, I have several ailments. I have bad hip joints. I have bad knee joints. I have chronic tendonitis in my chest and shoulder that makes moving painful. I get fatigue and weakness a lot, and sometimes just walking half a mile to my local supermarket exhausts me. I'm not overweight and I'm not aware that I have any serious underlying health issues; they don't know what's wrong with my joints and never investigate further, and they only diagnosed my tendonitis and told me to "rest." I still have it chronically.
I look "normal" from the outside and people must wonder why I'm moving with such difficulty, if they notice, because I look like a normal healthy person who ought to be moving faster.
I try not to be in anyone's way -- I believe I'm more mindful of that than other people, actually. I actually position myself always to leave space for others, but I notice that nobody else does that on a sidewalk, not even if they've stopped to chat to someone, or have five kids and double baby buggy. I think I'm one of the more considerate people regarding not getting in people's way. I can't help being slower, everything freaking hurts on my body.
I don't bother with a doctor because they've dismissed my concerns before.