If you haven't been riding bikes quite a bit for the past few months, it could be just newbie soreness. Remedy is to ride 30' every day for many days. The butt gradually adapts.
If that's not the case then it's that these saddles don't work for you. A good starting point is to go to your LBS and get your butt measured, then see if they'll let you trial saddles. Usually they want to to buy a saddle, but you can return it for another until you find one that works. If none of them work, you wind up with a saddle that's not quite right, but you're probably better off than you are now. At least you'll know the general appearance and feel of something that might work better.
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Results matter