I'm obsessed with sheet masks! So much so that I buy them and hoard them. I put them in a drawer and I count them, I admire them, I think about which one I am going to use next. But, it's the "one time use" thing that makes me hesitate, deliberate, commiserate (with as well as for myself, of course) about actually using one. I have the same issue with bottles of wine that were gifted to us by friends on special occasions. Every time my husband reaches to open one of the "special" bottles, I break out into a sweat and scream "NO, this isn't a special enough occasion!" and the wine then rots away in the bottle, usually in direct sunlight, and turns into something even I can't bring myself to drink.
I should also tell [those of] you [without psychological barriers like mine] that if sheet masks are not in your skincare arsenal, they probably should be. They are great for extra hydration (especially when traveling), soothing redness, scaring the kids, and taking selfies:
I've recently began to break through my hoarding tendency thanks to this tip: don't throw out the package right away! What I've been doing is putting the mask package inside a plastic bag after removing the sheet mask itself, and then using the remaining serum as part of my skincare routine (after toner and before moisturizer, day and night) for as long as it lasts.
It really makes spending the money on the mask and then USING it a little less painful for me. Yes, the packages are very pretty, but they aren't doing me any good just sitting in my bag o'masks in my bathroom. Just like the wine isn't doing me any good sitting on the shelf.