stop losing things

i lost two of my favorite earrings(from two different pairs and therfore more sucky and less neat and tidy) within the last week. luckily it has been unimportant things lately. Before it has been my check card, watch, student id, my dorm room key had been lost and/or left in my room multiple times, an awesome book i got moderately easily online (the one Jon Stewart wrote) and my bedroom key, the loss of which is still very important as i cant lock my door anymore and i really need to with this family.
Of course, my father is not helpful in this (as most arent). but im trying and its will mostly be alleviated once the other mental issue is too.