New kitten is scared

I just got a new 4 month old baby boy kitten. We put him in his own room with a litterbox, food, water, toys and a place to hide but he's really scared. Whenever I try to go in there to pet him or get near him he hisses at me and runs away. Is this normal? Should I keep trying to pet him to build a trust? Luckily he did eat and use the litterbox.