i have a question about back posture.?

snipe4lyf

New member
I was wondering why my butt was so sticking out lately, so i looked at my back. It shows an S line. it looks like a girl's back, when i am a boy. I am 14 years old, and i think i started to have sticking out bum starting from age 8. People adviced me to make my back straight by breathing deep, relax shoulders and stick my bum forward, but after doing that for a little, it feels uncomfortable, so i get back to my normal posture. Any way i can improve my back posture and make it straight?
 
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