I'm with the others. As you grow, and it could be very little to a fair amount, previously unexposed areas are now rubbing. Part of that too is the libido increases as your body's T level rises, causing some swelling and making the swelling increased. You will have to get used to it just as an xy male has to deal with penile growth at puberty and increased libido.
A packer would certainly cause rubbing, so its your choice as to whether to continue wearing one or giving it a rest for a bit. The feelings you are having are normal, so don't worry too much about it.
sam1234