Try getting a nipple that is somewhat similar to your nipple maybe that will help
Have you looked into the MAM bottles? We are actually going to be breast and bottle due to my health and my medications... and I read up on the reviews and received a few of their bottles in my registry gift bags.. we love them.
Hey! I will recommend you this. https://www.popsugar.com/moms/Best-Bottles-Breastfed-Babies-16069693