If you don’t want a part of your body to get sore, then that part shouldn’t be pushing against something that doesn’t move along with it. That’s the thinking behind the vabsRider bicycle saddle, the two sides of which pivot in time with your pedaling.
There are many folks at 100kg or more riding comfortably. Having properly fitted equipment is critical.
I recommend stopping by a bike shop, they’ll often review your fit for free or very cheap the difference is massive.