Also, do be afraid to talk to people who are in a group. My group tends to be together most of the time, and I've noticed if we don't reach out to the people in line near us, they won't try and talk to us, yet I can see them in line with others striking up a conversation. If you talk to a group of people, 1) there's less pressure for you to keep the conversation going because there's more people to do it, 2) there's more likely someone in that group that is willing to go the extra mile and have a friendly chat, and 3) your more likely to find at least someone you click with.
I know in my group, almost all of us have a very different personality type. Me: Shy and quiet to strangers, but sarcastic, dirty joke minded, and playfully mean to those I know. Phoenixwolf: Serious, dry humor, boss/'this needs to be done at this time', very intellectual. Angelphire: Hyper silly, smart yet clueless, funny banter. Whitecougar: super friendly, easily excited, gofor.
When you jump into a conversation with a group that is diverse like that, you're more likely to click with at least one of the members, and then once you get to know the others more through that person, you will probably find ways that you click with them two. Then that one conversation you had that made you a friend, makes you more.