recumbent bike ?

anyone on here who can use the bike without pain? I don’t have pain while using the bike but after sitting for a while 15 mins + , i start to ache in the tailbone region & when i stand up it just feels stiff or very achy in that region . After walking for a bit it goes back to what it was before the bike. Is this still okay if i’m willing to put up with that or is that possibly causing long term damage ?