Thanks.
I came back from a music group at my school a while ago (I shared bass playing duties with another guy, and I asked to switch to guitar the next time), and overall I feel really good that I dared to go there.
Several of the people there initiated conversations with me and seemed to like me, and a cute girl also walked with me to the cafeteria during a break (wohoo).
I did however feel a bit stiff and had that somewhat gloomy feeling, since social situations like that kind of feel like being present in a situation where I wish that I could be more outgoing - it's hard to describe, it's not exactly shyness, it's more like I am being overly careful and feel frustrated that I cannot relax and have a good time the way I want;
it's a little bit like feeling that opportunities to make an optimal impression in front of new people are constantly lost.
But I am glad that I went there, and I certainly felt empowered by the whole experience.
I will go there next Monday as well (in fact, I am now officially a member there), and I am fairly sure that I will feel more relaxed that time.