Hey there, I'll try to put some perspective on this. You came here because you needed support in learning to cope with and live with a disease. It's entirely possible that many of your symptoms were such that no-one in your life understands in the least how you feel.
So, one day, you come to KA and say, "This disease is causing this, this, this, this and this. I never know when I go to bed at night if I'm going to be able to move in the morning. I never know when I eat something if it's going to affect my mobility. And what hurts like hell one day, feels fine the next."
Everyone here has experienced this, daddio. In our own ways and to our own levels of degree. My visible physical presentation isn't anywhere near as bad as that of some here, but my invisible symptoms have been experienced by pretty much everyone here at some point or other. In a support group, part of the dynamic is that when someone expresses pain or anger or anguish, or reports a symptom that is new, someone else has probably experienced it. In this case, we have over 4,000 members worldwide, with a few hundred who post every day. The odds are that a fair few are going to have had similar experiences. And this being a support group, the odds are even greater that they are going to post their sympathy, support and understanding of those experiences.
The other part of the support group dynamic is doing what you just did. We'd all like to think that support is always positive, but it isn't. In fact, I'd be scared if it were. Why? Because, for this to be a true support group, we must feel free to express our feelings and thoughts in an honest way ... bearing in mind that due to the written/online nature of this support group we cannot hear vocal inflections/tone of voice, see facial expressions or read body language. Misunderstandings of intent are frequent, but overcome with understanding. You have been honest with your concerns, and as someone new to KA, not understanding fully the nature of this forum, your concerns are valid and understandable.
However, one thing that you will come to learn is that we are more than our symptoms. We are a family that truly cares about one another. Some have horrible symptoms from a multitude of autoimmune based disease (such is the nature of autoimmune disease). Others, don't.
Welcome to KA.

Hugs,