Is it normal to hate being on camera even when I know my field?

Yes, it is completely normal, and it says nothing about your ability. Being brilliant in your field and hating the camera are two unrelated things, because they use different skills. One is knowing your subject. The other is being comfortable while being watched, which is a learned behavior almost nobody has naturally. The discomfort you feel is the default human response, not a signal that video is not for you.

Expertise and camera comfort are different skills

A surgeon can be world class in an operating room and stiff on video. A lawyer can command a courtroom and freeze recording a thirty-second clip. This is not a contradiction. The courtroom and the clinic are environments they have thousands of reps in. The camera is a new one. Comfort comes from reps in that specific environment, not from transferring confidence out of another.

So when you feel awkward, you are not discovering a hidden weakness. You are a beginner at one narrow thing, which is exactly what you should expect to be.

Why being watched feels so strange

On camera you become self-aware in a way you never are while working. You hear your own voice, notice your hands, second-guess your face. That self-monitoring is the discomfort, and it is loudest at the start because everything is unfamiliar. As the setting stops being novel, the self-monitoring quiets down. Most people who stick with it stop noticing the camera within a couple of months of regular practice. The feeling is temporary, even though it does not feel that way in week one.

What this does not mean

It does not mean you should wait until you feel ready, because that day may never arrive on its own. Comfort is a result of doing the thing, not a prerequisite for it. The experts who now look natural on camera almost all hated it early. They did not wait out the feeling. They worked through it, usually starting small, which is covered in how to actually start when you freeze.

It also does not mean the discomfort has to be faced alone or all at once. A gentle ramp and a second set of eyes on your setup make a large difference, which is the whole idea behind getting comfortable with support.

Bottom line

Hating the camera while being excellent at your work is normal, common, and temporary. The two skills are separate, and the discomfort is just unfamiliarity, not a verdict. Do not read it as a reason to stay invisible. Read it as the ordinary starting line that every confident person on video once stood on.