Has my butt gotten bonier somehow-hurts to sit?

OK super weird question, but today I noticed that my butt cheeks starts to feel strained and sore when I sit on hard surfes for a few minutes or more, like i feel the bone pressing against it-is this normal? Has my butt gotten bonier somehow and how to fix this? Also, its been happening all day...
Has my butt gotten bonier somehow-hurts to sit?
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