People can have very different first-time experiences, so it's not surprising that yours was different from that of your roommate and friends'. Some women bleed a lot, some a little bit, some not at all. I don't think what you're describing sounds abnormal at all.

You might find some of the comments on this entry (http://community.livejournal.com/vaginapagina/3174821.html) and this one (http://community.livejournal.com/vaginapagina/8702284.html) reassuring/helpful, as they feature members describing their own (greatly varied) first-time sex experiences.