For years I have sat with slouching posture. I slide down in my chair so low to where my head was touching the back of the chair. For the past week my neck and shoulders have been hurting so I have tried sitting right. I have slouched so much that even when I try to sit right my shoulders are slumped and my head sticks out. I know sitting like that is just as bad as slouching. Do you think that I need to buy one of those expensive shirts that forces people to sit right?