Is bad posture a turn off?

I have really bad posture. I slouch a lot. It's probably a combination of me slouching a lot when I use the computer and maybe low confidence.
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Ah okay so follow up question. If I were to fix myself and have good posture, will a girl like me again? I really like this girl but I'm pretty sure she knows I have bad posture. If I were to not see her again for like 4 months and when she sees me again and I have better posture, will she forget I had it?
Is bad posture a turn off?
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