Absolutely. No judgement whatsoever.
This is a normal feeling. You are not alone. Many (probably all) of us feel this. I certainly do.
You are grieving the idea that you had about what your life would look like. All the stages of grief are normal.
It's okay to be angry, it's okay to feel sad, its okay (but probably not effective long-term) to try to control the symptoms away.
Ideally, you work towards building a new idea of your future and can accept it. Obviously, that's easier said than done.
If you don't have a therapist who can support you, finding one is a good start. You need someone (or two people) who understand(s) grief counseling and CBT for the central sensitization.
Also, when you look at other people who live with chronic illness or visible physical differences that affect the way they move through life, do you see them as defective? If not, why, and how is that different from how you view yourself? Most of us are more negative towards ourselves than towards others - try giving yourself some of that grace.
Remember: You feel what you feel. The feelings are not bad - they are messages. However, your fibromyalgia emphasizes negative emotions as well as physical sensations, which is why things like CBT and other mental techniques are so important.
You're not alone, you are having a perfectly normal response, and we're here for you.