If your windows sticker does not mention DRL your car most likely does not have it. Every manufactures strive to list as much "amendments" as they possible can get away with. I wonder why they do not list a steering wheel and a roof over your head.
If it still bugs you and you want to investigate things further, you can do a few things at your leisure. Stop by any Nissan dealership (or another maker for that matter) and just browse a parking lot looking at the windows stickers and what is listed there.
Another thing either call or get to Nissan website and see if you can provide your VIN and verify whether it has DRL included.
Finally, a couple vehicle with DRL I owned had a DRL indicator light on the dash. See whether you have a place for that light on your dash, and if it mentions in you owners manual.
Hopefully, you will get over it. Make it this year resolution...