Does anyone have any idea what could be the reason behind being verbally impulsive?

It's gotten quite bad lately and I'm eventually going to end up pissing someone off if this carries on. I have no control over what I say when I'm in front of a large group of people, or someone I'm nervous around.

Today I accidentally revealed a very big secret of mine to my large group of friends without wanting to. I feel horrible horrible horrible. I never in a million years thought I'd tell anyone and it was as if I was drunk and couldn't close my big mouth. And now it's said and I feel like fainting thinking about the fact that I revealed such a thing to these people who barely know anything about me.

I'm crying right now, this isn't the first time I've done this. I'm so afraid I'm going to hurt someone or myself because of this. It doesn't happen all the time, but when it does, it's usually when I feel like I'm "high" or drunk. I'm scared of myself, I'm so angry with myself right now.

I never used to be this way, only the past couple of years has this been happening. Is it the anxiety? I wasn't even that anxious. Oh my god oh my god.