Hi Ana,
I think you will meet other pilgrims, but it is less likely that you will find company for your entire journey as most pilgrims walk about 20 km/day. Some may walk 15, others 25 or thirty. But walking only 10 km is rather an exception.
In my opinion it is safer to reduce your belongings that you take to the camino than to use luggage transport to prevent theft. They will just drop your luggage in front of the albergue or - sometimes - in the communitary zone of the albergue. So everyone could get hold of it. Only the things which you do not bring can not be stolen.
Luggage transport in my opinon is a good thing for people depending on medical devices. So they can send them ahead.
BC
Alexandra