Could having bad posture affect how someone grows?

ok so since i was 10 i have had bad posture everyone says when I'm not paying attention i walk like a caveman lol anyways, my dad is 6' 6'' my bro is 6' 8'' and my mom is like 5' 8'' or something right now i'm about 5'9''1/2 and it sucks bc i'm a sopre in high school, its also pretty bad bc i am very small and i don't understand bc I eat all the time so I don't understand it can someone please help?!!!