Meeting my boyfriends mom

Okay so I have already met my boyfriends mom and she didn’t seem to like me bevause I’m a really happy giggly person and shes not. I’m gonna meet her again today as the girlfriend and I’m Very scared to. Idk what to do or say. Please help with some conversation ideas or how to act. This is my second boyfriend and my first one was two years ago. Idk what to do.