Why do I get tailbone when sitting straight? ?

I’ve been trying to improve my posture by sitting straight but everytime I do this, my tailbone hurts when I finally stand up to do something. This doesn’t happen in my normal posture where I slouch. I’ve been slouching my whole life. I’m 23. I’m trying to figure out whether if I’m not sitting on my butt when sitting straight or because it’s normal for having poor posture? 

Update:

I meant Tailbone pain in the question lol

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