Many of us, myself included, get so obsessed with doing things "right," or at the very least not doing anything that could be perceived as "wrong," we organize much of what we say and do to avoid ever being "wrong."
This superficially focused yet deeply-ingrained striving for some unattainable, deprivation-based goal can easily overcome a good life, and swallow it whole. And those feelings can turn deadly for some of us, or at the very least, consistently ruin our days.
To boost your confidence a bit, practice being a bit more out-going and assertive with your coworkers. Ask one of your colleagues out to lunch, join in a water cooler conversation, make a comment or raise a question at a meeting.