Treaveth,
I think what you lack is understanding who you really are and the understanding of your enormous potential that God has bestowed upon you. The people you're standing before are also men like you, which should not in any way scare you. Start by not being shy when you are with your colleagues, contribute to discussions, share your opinions and above all never under-estimate yourself.
I recommend that you read books on Public Speaking and Understanding your purpose. You can get authors like; Myles Munroe, John Mason, est.
Stand up & Be yourself, your generation awaits you.
Cheers.