You clearly know you need to know more people. Make a list of the types of people you would like to meet. I personally like to meet people who are passionate, inspiring, out-side-of-the-box thinkers who don't hear no, and who take action. When I'm networking, the minute I meet a complainer, I hear him/her out and then go on my way, without asking for a card, and rarely giving mine unless they ask for it.
Instead of looking at it as networking, look at it as you being an interviewer for people who fit into your network. It's not about going to an event and being afraid of being judged, it's about seeking out like-minded people. Sometimes you find them, sometimes you don't. But you always learn from the experience.
To stay current on The Greenlight Coach's speaking engagements, recommendations, and work success articles, sign up for her free newsletter at the top of the page and get a great bonus 1-hour MP3 on creating powerful business partnerships when you do!