I would *like* to be some supporting character, adventurer warrior that has a pivotal role in the plot on the good guys' side. happy to traverse hundreds of miles. I don't mind camping and trekking and having interst in herbs survival and things.
otherwise, being shortsighted , I would probably be some artisan, creating stuff for a library, or, more glamourous occupation would be an armourer detailing armour, carving stuff like that in leather or metals.
- or knowing my luck, be a road sweeper in the town! - all those horses trotting by will leave quite a mess. Saving up the pennies I get from selling the 'stuff' I shovel up as fertilizer to buy a good ale at the end of the day(though I'll probably be sitting on my own from because of the day job! )
-but I would still wander about the surrounding country on my days off or after work- and while 'dumping my excess load' in the nearby forest (on order of the town major to get rid of the stink when I was trying to stock pile it all) I would clumsily trip over some tree roots and into the fairy land below through secret holes in the grass. Then, magically, my eyesight is perfect and I'm worshiped as a giver of life to the forest because of my day job! mmm. might have to jot that one down for a short story.
I guess if I was brought up in medieval times, and not the current climate to compare with, I wouldn't miss a lot of the creature comforts or worry about walking around a lot because it would be all I knew to live in that time.