I can't keep my legs down the chair when I sit - Is this a bad habit ?

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This happens to me always . From my childhood days , I am sitting in the floor of my house . Since there were no chair of sofa , I used to eat , sleep , sit and play and even watch TV sitting on the floor . This was happening till 2007 when we a brought a new set of Dinning Table and a Sofa . Since then I was asked to use it . But I was not comfortable with it . For 15 years , my legs have been accustomed to sit on the ground that I could not keep my legs down when sitting on the chair . So , I started keeping my legs on the chair from then . All my relatives who visited my house made fun of me . Then what can I do , I just shifted back to my old practices . ( Sitting in school bench was not a problem because there is ample space to keep my legs up and no one cares about it .) But things worsened when we brought a car a few days back . And now I think you would have understood what would have happened . Why all this has to happen to me ? Is this the way I am going to spend my remaining life ?