Yeah I'm always worried if I've locked the door or not, and keep checking if I've actually done it right. I also do this with my rabbits cage. xD
When I'm out and about I'm constantly checking my pockets to see if things are still in there, and I check the contents of my bag every 30 mins or so roughly? It's getting a teeeeeny bit better mind you. When I used to hang out with people, I could tell it was really annoying for them xD They'd be all like "Ugh, just meet us over there when you're done"