Brain problem

I always have a problem with my brain...since young im always very forgetful but recently i found out that it has become more and more serious.
After staying at my bros house, already 2 times i forgot to lock the gate and door after i went into the house. the keys are left hanging at the lock.
Always forget to take my water bottle after i finished filling up at the dispenser.
Always forget where i placed my components which makes me spend a lot of time searching it back...
What happen to me...sumthing wrong to my brain?