I definitely know the feeling.
I have knives and machetes that I have collected and will never use just because I consider them "collected". They are not users.
I do have a bunch of users though - more than one for every day of the week. I usually carry two knives - a larger flipper of some sort (Cryo II or inexpensive Kershaw with about a 3" blade). Then one smaller more or less traditional folder/slip joint sub 2" blade. I also keep four Opinels in the kitchen. They are great slicers, easy to sharpen and inexpensive. I would expect that in the EU you should be able to get Opinels fairly easily for not a lot of Euro's.
Recently I went on a little binge and bought a few more knives and two pistols. Now I am waiting on my next paycheck to pay the mortgage so I have to scale back and enjoy the knives and pistols I have. I think we all binge a bit like that once in while. Nothing wrong with it as long you can meet your financial obligations.
I really enjoy just taking out a few knives to inspect and study the workmanship and designs. I think this is the "after the binge" phase. No need for new items to add to the collection until I can decide on distinct design/engineering features that none of my knives have. For example, I have been buying a few traditional folders lately. There are a number of traditional patterns and infinite variations on those patterns. One of my collecting goals is to have one good example for each of the major patterns. Manufacturer is a consideration as well. At some point I may start working on the variants but for now major pattern family is the goal.
But for now, just taking mental notes and documenting my collection. Maybe I will be able to buy a couple knives for myself for Christmas. If not Christmas then early next year. No rush. No spare money either.....
Anyway - don't feel bad. Enjoy your collection. Just plan for expanding your collection (if that is what you want) in a fiscally responsible manner. You can feel good about that.