Check the saddle fit. If it is the correct size give it a few weeks and see how it feels after that. As woodcraft said it takes a few rides for it to get used to riding. Also start off with short rides so you get used to the seat. If after that you still have problems then start looking. I have 4 different bikes with 4 different saddles and I’m fine on any of them but the common thing is they are all the same size saddles.