Therapist here...

I'm going to tell you what a paid therapist can't tell you. This how we actually think and can't tell people most of the time.

You had a traumatic experience when you were young that changed you, you need therapy for that. It's going to help with your anxiety. That's number one.

Second. You are right, your husband doesn't know, he doesn't know the person you were before or perhaps he doesn't want to remember. He's used to having you home the way you are, now a new job that is going to make you push those fearful boundaries and move foward (and probably discover you had nothing in common with him anymore) or you are going to change in a version of you he doesn't like or he can't control.

Your anxiety controls you and he does to, even worse, he used that against you. "You are not good enough."

My question is...why did he married you? If he doesn't believe in you, if he doesn't want to support you, if he thinks you really don't have something to offer. I mean yikes, if I don't believe in a person i wouldn't marry that person. You should ask yourself those questions. Make a list of what a person brings to your life, emotionally specially, very important, economy, support, etc and maybe you'll have your answer.

I think you are finally ready to live your life, new job, something you like and it will give you independence and he doesn't like it. He will bring you down every time.

8 years mean nothing if my partner pull that bs on me, he sounds petty, childish and jealous and he's using your fears against you to manipulate you. That should tell you something. Usually a person who is like that and does that, controls a lot in a relationship probably without you even realizing it.

Dream job it's amazing, go for it, don't even think about it.

Find some therapy for your anxiety and past fears.

Reevaluate your marriage, seems like you have some thinking to do.

I think you have an opportunity finally for a new life, a fulfilling life. Take it.

Good luck!