I don’t feel anything??

So i’ve been masturbating for as long as i can remember ( even when i didn’t know what it was ) and it was mainly grinding against pillows and even just mattresses but recently i’ve been trying to put my fingers in and even and old toothbrush and i don’t feel anything, i can feel my finger and such but nothing else, it doesn’t feel good or bad it just feels like there’s something up there, is that normal??