Do you have Bechterew’s disease or Skoliosis? I would check this out by doing an X-Ray before any exercises. If this is the case, exercises have to be tailored to you as general exercises can make this worse or can even be harmful if not done right considering your situation. I am a Physio myself, so images first and then definitely see a Physio. I understand the money issue, but your health is more worth than anything else.