ANSWER - Psychometry is the skill of using an object to pick up vibes from an object to generate understanding, knowledge, information or memory pertaining to the object itself, its surroundings or most commonly those who have used or handled the object. This is a genuine skill claimed by many witches and non witches alike. It is an interesting skill because it relies on a blend of intuition and logic. You can guess a lot about a person by being provided with one of their belongings and this is of course where the logic comes in. If you handed me an antique Victorian hair brush I'd be able to have a pretty educated guess as to the type of owner, lifestyle, house their lived in etc. etc. This kind of deductive logic is often played upon by charletons who falsely claim the gift of psychometry. A person who genuinely has the gift would be able to tune into the vibrations of the object and (for what of a better word) "see" rather than deduce the association. I'd be surprised however if even the most genuine of psychometrics wouldn't use an element of deduction in there as well.
I have some experience in psychometry but it is very much limited for me to being a memory trigger. I can use objects to help with recall and to an extent to immerse myself in sensory experiences relating to an object. I have a table from my grandmother's old house that has proven to be a very valuable link to allowing me to go back to that house in my mind. It is of particular importance to me because I use that house as my memory space for meditation and being able to experience the sights, sounds and smells associated with the house helps with this greatly. However I would not consider myself to be gifted with the skill of psychometry as I cannot personally pick up an object belonging to a stranger and experience their memories. I can only use the skill to the limited extent of unlocking my own memories.
In terms of your own experience I would say that you sound pretty similar to myself. Your experience is both a genuine act of psychometry and a trip down memory lane. The memories are fuller and more vibrant because you are tuning into the object and using the vibes and associations to aid your memory but the memories are not coming from the object itself they are coming from you, you are simply using the object to unlock them. This doesn't devalue your experience and certainly you are using psychometry to some extent though possibly not in the strictest interpretation of the term which would be to use the object as an aid to extra sensory perception and gaining actual knowledge from the object rather than unlocking existing memories from it.
You may well find that you have a greater skill in this area than I do and that unlike me you are able to "read" items belonging to other people. The only thing I can suggest is that you have a go and try it. Get a few friends to give you some items belonging to their relatives and try reading the object to see if you can get the same kind of experience that you managed with a personal object. It is a valuable skill to have indeed if you do turn out to have a flair for it!