You didn’t mention if you have explored treatment options. There are both non-surgical and surgical interventions for managing or mitigating Scheuermann’s Disease (a curvature of the upper spine that can result in a humped back). If you haven’t already done so, the first thing to do is to talk to your doctor about your options. You might also want to research options on the internet to prepare for that discussion.
If people you know are the people who are taking offense, please consider telling them about your medical problem. People often get uncomfortable with something they don’t understand. A little information can go a long way toward making both you and them more comfortable. For people new to your life, you may need to come up with a simple explanation to alert them to the fact that you aren’t being rude but instead are accommodating a medical problem.
For example: I wear hearing aids. One of the first things I say to people I need to interact with (whether a clerk at a store or a new colleague) is something like, “I wear hearing aids so if I ask you to repeat yourself, it’s not that you weren’t clear, it’s that I need a repeat to understand you.” It has never been a problem. However, it has been a problem when I’ve forgotten to tell people up front that I’m hard of hearing. Then folks get annoyed with my misunderstandings or my requests for repeats — until I remember I have to let them in on the problem.
I wish you well.