Perception is a funny thing. Because of my self confidence, I assumed I did not mean that much to these guys and didn't talk to them that much while at class in high school. But recently, while organizing some books I opened up one of my yearbooks and looked at some of the end of year notes written by classmates. One of these guys wrote the nicest note ever in the book and thanked me sincerely for the times we enjoyed at and after work. I don't know if you are young but sometimes our perception of ourself is scewed in the sense that we do not always give ourselves enough credit. Perhaps they also assumed that I didn't want to be friends outside of work either (neither of them had gfs--they still had a lot of growing and maturing to do but so did I!) You are probably an interesting person--it is only confidence that holds you back!