That's a head from The Mesh Project. Fair warning though, to wear the head you need to have the body.
Webpage: http://themeshproject.org
Slurl: http://maps.secondlife.com/secondlife/The%20Shops/128/128/4
Review of body: http://meshbodyaddicts.com/mesh-body-reviews/mens-bodies/tmp-mens-body/
Ha! You sound like me, I'm a chronic lurker and part time creeper. I always feel a bit lost once the shopping buzz wears off, but I mostly explore and try not to look too awkwardly out of place.