One of my mentors once told me that to be a productive scientist, the key was to avoid any participation in committees and organizations. This individual is a well-respected scientist and a leader in their field, so I listened although I fundamentally disagree with this idea. How are you to improve anything if you don’t get involved and have input? It is far easier to stand on the sidelines and complain than roll up your sleeves and join in. I am (like most scientists I think) naturally an introvert and therefore suffer normal anxieties about meeting people.