Riley,
First, I would make sure you check in with a doctor to make sure there is not something more serious going on medically. For now you may want to check into using some kind of an absorbent pullup underwear product. with that you would not need to change so often. I use many of the products from NorthShore and here is a link to their page on the pullup style products. They will send you samples for free for you to try. Let us know how you are doing.
https://www.northshorecare.com/adult-diapers/adult-pull-ups