Is my hunched back caused by bad posture?

Orange Peel

New member
I am 18 and often find myself hunched over while walking and on the computer. When I notice it I straighten my back but I have found that a lot of time I do it without noticing. It's really bad. Is this because of bad posture or because I have bad back and chest muscles? Anyhow, what can I do to fix this? It seems like I do it a lot
 
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