Not able to keep up in meetings

So I come from a very traditional company to a startup and when I’m in a meeting with seniors and directors, a lot of what they’re talking about goes right over my head. I have a hard time just keeping up with the pace that they’re going.

Lots of it involves domain knowledge but some of them have only been hired a couple months earlier than me and the gap is just ridiculous.

Is this normal or am I fucked