Sense

life is good

Today, I found myself Googling "selective memory" to see if it actually exists. I’ve noticed that whenever someone reminds me of an unpleasant event from my past, I often have no recollection of it. 

However, I vividly remember every good experience I've had. There are some bad incidents I do recall, but not as clearly as the good ones. 

It’s not that I consciously choose to forget these events, they just don’t stay with me. I’m not sure if this is a medical condition, though Google says it isn’t. I just hope it won’t have any impact on me as I grow older.

What you think is "selective memory", is a phenomenon whereby as you grow, you garner more knowledge which equates more memories. The brain isn't a built computer but functions more than a computer in many ways. Now, see your brain as a clock (this brain will house the memories). Clock never stops ticking. The brain constantly travel across all the memories stored in it both good and bad, it brings to your immediate visuals, the one of immediate need. Simply say, the brain mouses over everything kept in it at all times, as needs changes and life keeps evolving daily, there are things of recent importance kept in your brain you would be needing, these are the ones the brain will present to you when you query it. Querying your brain will make it mouse over everything it has and match your query with what it has if any match is found. For everything the brain keeps, there is a pattern to it, the memories you think n longer exists, are the ones you forgot the pattern you kept them with. You trace the patterns