You can be self-centered and not act that way. If you even pretend to care about most people's lives they will care more about yours.
If you want to do this without being crazy bored and feeling terrible, I recommend figuring out conversation topics of other people's lives that you actually enjoy listening people talk about, and also working on being friends with people who do interesting things. In a college town, asking someone their major is quite often going to be enjoyable for them and if you're interested and have some knowledge of a wide variety of fields you can easily find out interesting things.
r/Fitness does a weekly "Moronic Monday", a judgment-free thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. I thought this seemed like a useful thing to have here - after all, the concepts discussed on LessWrong are probably at least a little harder to grasp than those of weightlifting. Plus, I have a few stupid questions of my own, so it doesn't seem unreasonable that other people might as well.