Poshmark Sales

I have sold over 200+ items on Poshmark for 2024 and all of the items were my personal items.  The question is since it is over 200+ items and made $15,000.00 at a loss how do I account for all of these items as a lot of these items I have had in my closets for over 2 years or more.    Everything that I sold was at a loss even before Poshmark took their 20%.    Please help as I thought that doing something fun is going to turn into me having to pay taxes.   I am hoping that I shouldn't as again like I said all items were sold at a loss.   Only a few items were NWT but, still took a loss.