I am insecure too and I definitely know what you mean about second-guessing yourself when it comes to communicating with others. One thing I've noticed/learned though is that most people are too wrapped up in themselves to spend too much time thinking about something I've said!! Or perhaps they are even second-guessing themselves about things they have said. Either way, most of the time I honestly don't believe that other folks think we've made a fool of ourselves or dwell on things we've said, even if we think we've revealed too much/said the wrong thing or whatever. I know being insecure like this can be a real PITA though. I hope you're able to shake the feeling soon!