I was very sure that I had done everything right.
I was very sure everything was right.
I was very sure I knew my stuff (informal here)
Hmm, I don´t know what you meant, but at first I would say "everybody was looking at you", but certainly after the big bang they did stare at you!
stare /steə r / /ster/ verb [ I or T ]
to look for a long time with the eyes wide open, especially when surprised, frightened or thinking
The instructor showed me that was only/just a mistake and went away.