Hi!
There are several instances where on-and-off bikers feel different types of soreness but doctors say that these soreness issues should not be counted as normal pain otherwise the conditions may get worse. These changes might help you with your problem:
Tweak up your bike's set up especially if you're sticking to rides or classes that are around two hours long.
Ensure that the handlebars are positioned according to your height.
Get shorts that are padded especially for biking.
Hopefully these hacks will help you out.