Apple Silicone case

I have never owned an Apple case for my iPhones except for the black case I got for my iPhone 7 Plus. I really like the case but after six months of using it, it has a weird and different feel to it. It's almost uncomfortable to hold as it is like sticky or something. Is this normal for these cases? Is the case just breaking down from the oil's and so forth in my hands? I'm tempted to go buy another case because I can't stand the feel of it now. Anyone have any similar experiences with the silicone cases?