New Job Nerves....

Hi there, I'm really struggling at my new job... It's not that I don't know how to do the work or anything like that... it's just so overwhelming being around all these new people and knowing everything they expect of me. Every time someone asks a question in a meeting, I get this fluttering feeling deep down... Like maybe everyone will notice my mistakes eventually. Even the smallest things seem daunting now. It feels like maybe I'm not cut out for this career at all... Maybe it's just nerves? But how long do these new job jitters last... before they tell me to pack up and leave... or is it normal for people starting out to feel so unsure of themselves.... Have any of you felt this way? Is there hope?