How can I overcome crying when feeling under pressure? When I

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How can I overcome crying when feeling under pressure? When I was a teen, I used to clam up completely which would make my parents upset with me. I couldn't talk or form the right words quickly. I always need a couple of minutes to regroup myself and speak. It isn't as bad now that I'm 26, but I still can't help but to start tearing up when I'm feeling immense pressure.
I've got an anxiety disorder that I've been working on for years, and crying is one big thing I'm trying to get under control.. When I talk to my boyfriend and he keeps asking "What's wrong?" "Are you okay??" "What's wrong!?" I feel super pressured and I can't help but to start tearing up. I hate it. It's making my boyfriend worry that I cry every time we have a serious talk, which in the end everything turns out okay, but he still thinks I'm miserable.
It feels like I'm in the spotlight, and I have to say something NOW when I'm under that kind of pressure. I'm 26 years old, and I feel pathetic that I can't get this under control.