keeping the inventory of everything

We are all weird in some ways. No harm is done, unless it huts someone else. I am the opposite and I cannot seem to keep track of anything. That´s as normal as your example, I suppose. I find the things I´m looking for when I don´t need them anymore. some of them, I never find as I have thrown it away thinking that I won´t need them.

There is nothing wrong with inventory. I don't have a lot of assets to do such inventory. But,I do put a number for my dvd collections...for easy counting.

nothing is wrong doing so. some extend it is normal but i perosnally feet that keeping inventory causes loss of memory.

For some people, this is a normal thing to do. It's actually a good practice to keep a record of your assets, as well as your liabilities. Some prefer having a notebook or a ledger, others use their laptops. I myself keep a record of my stuff although not that detailed as an inventory.