100%. And I'll tell you something, as a Consultant who had finished their MBA I felt the exact same way! Honestly, most everyone does.
First, read this...25 tips to surviving (thriving) in consulting:
Second, read these other Q&As on the topic of confidence
Third: In terms of doing well in your role when you're there:
1) Understand the context/prompt (what role are you in, what company, who's watching, etc.)
2) Understand the objective (what, specifically, is expected from you...both day to day, and in your overall career progression)
3) Quickly process information, and focus on what's important - Take a lot of information and the unknown, find the most logical path, and focus on that.
4) Be comfortable with the unknown, and learn to brainstorm - think/speak like an expert without being one
In summary, there will always be a flood of information, expectations, competition etc. and not enough time. Find out which ones matter when. (i.e. be visibile and focus efforts on the things that people care about)