Smoke some pot, then use eye drops.
Nobody really notices small pupils, it's huge pupils they look for haha.
Don't be so paranoid...
You can always get some of those eye drops that eye doctors use to dialate your eyes lol.
Then you'll be looking like you've combined some LSD, MDMA, Xanax, and meth.
Honestly man, light makes everybody's eyes small, dark makes em big.
Wear sunglasses is what I do but that's usually to keep my eyes from watering in the bright light of the sun..