Almost 10 month old not crawling or trying to pull up?

my son will be 10 months on mon. he does not like being on his tummy for long and he isnt crawling he slides across our hardwood floors to get where he wants to go and wont get on his knees all he does is fuss.as for pulling up if i put my hands out he can pull up but cant on furniture yet should i be worried or is he just not ready yet?