Am I the only one that has weird memory issues or overlooks stuff?

When I'm looking through the wrong answers and scores on my tests, I ask myself, "How did I get this wrong" or "I thought I had the right answer or explanation but how I did I choose the wrong letter choice or answer." I also have forget certain kinds of stuff really easily. Yesterday I forgot I didn't finish my milk and when I saw it in the refrigerator, I thought it was someone else's. ;-;