I too, am a loner. Mostly it is because I haven't met anyone to ride with. Now that I have moved to a more populated area and found some weekend rides (thanks, Kano!), I may start riding with a group on a weekend or two. I don't mind my solo rides, though. I think that is because I have always run alone, and now I bike alone. It doesn't bother me.
Four wheels move the body, two wheels move the soul.
2010 Kelson custom/Brooks B17 Imperial
2009 Masi/Terry Damselfly
2004 Specialized Dulce Elite/Terry Damselfly
2003 Gary Fisher Tassajara/unknown saddle
1987 Bridgestone 100/Terry Liberator X