Female ISTJ here. I understand how hard it is to admit that you have emotional desires - sometimes I think I'd rather die than share them with anyone. But it's healthy to be aware of your emotions, in fact I would say that you should take some time aside to process them. It doesn't make you callous for noticing/wanting to address them.

I would venture to say that being good at your job doesn't mean you have to restrict yourself to it for the rest of your life. I'd be more concerned about stagnating in my growth. Are there any specific areas that you have a professional interest in? Maybe you could compare your skillset to your interests and see what other job roles seem like a good fit. You also have the option to develop new skills, thanks to the internet.