road rage or just me being angry?

I'd like to know if anyone else experiences this situation at super markets. Maybe it's just one of those situations where I'm making something out of nothing. The able bodied shoppers like to stand wherever they so desire even if its in front of an aisle or an item I might like to access, I'm not much of a yeller so I expect most sighted people to see a fat guy wheeling toward something and be courteous. I might need to navigate exactly where they are but no they'll stand where they please, I try not to say "excuse me" alot because it loses its meaning after the first twenty times and I'm afraid I might yell or at best GROWL it, Don't get me wrong, I'm not a bitter driver, the last thing I need is to give the community a bad name. And I certainly don't go around with a sense of entitlement , but I just expect a little give and take from my fellow shoppers to not block an aisle. I'd love to use my cane in the store but I'd get exhausted after 20 feet and it might take me till next year to finish my shopping. Let me know if this has happened to you