I can’t stop sucking in my stomach

ni

I’ve been sucking in my stomach every time I go to school since 2nd grade. I’m in 8th grade now, and I just realized that I can’t stop doing it. I’m always sucking in my stomach now, 24/7– even when I’m relaxing at home. It feels uncomfortable if I’m NOT sucking in my stomach, and it’s almost like having a sucked-in stomach is the new default... is this normal? Will I be okay?