After walking through the streets of this world, I swear I will never eat off my shoes again.
* What does the text in bold mean?
I presume you noted this on the MySpace website, from the contributor in Oregon.
In English, we have an expression that goes, her floor was so clean you could have eaten off it. That is, she is such a perfectionist when she cleans, her floor is hygienic enough that one could eat off it just like you would a clean plate.
Now, say you eat in a particular cafe or restaurant, and then one day, youu see inside their kitchen, and it is filthy. You might say, I'll never eat there again (because their standards of food hygiene are so low.)
The contributor is regarding his shoes like a plate, and says, he has travelled the world (he has seen a lot of life and gained a lot of experience in this travels, and has been shocked by what he has seen.) He is figuratively saying, just like his mind has been shocked at what he has witnessed, his shoes have been "dirtied" or "soiled" in these travels, and he will never see life as beautiful as he did before ever again (just as I will alway have the picture of that dirty restaurant kitchen in my mind and never eat there again.)