Hi Sorceror 666, my take on it is that it's really hard to tell when someone doesn't like you. However, even if you're nervous, the other person usually is as well and may still want to be a friend. I personally like to keep a guard up, although a friendly one, until I can get to know the other person better. That way if they let me down, I can just move on without any grudges.

There can be a thousand different reasons a person doesn't want to be a friend, so it's never good to assume a reason that they don't like you personally. For example, I've cut myself out of possible friendships in the past because I'm so anxious about making friends in the first place. I was just so worried they wouldn't like me that I continued to ignore them and hoped they'd forget about me. Some took it well, and some took it badly. I think when you run into someone who thinks little of you or doesn't want to be a friend, I think it's best to move on and put it behind you. Consider them one more person you had to go through to find real friends.