Wow, I totally admire those of you who are more or less on your own. If it wasn't for my supporters, I may never have started cycling. DH started 2 years before me, just for commuting - he never did weekend rides until I started riding. About 60% of my inspiration to start riding came from 2 of my girlfriends who started riding a year before me, then I in turn inspired the 4th one of our little group to start riding as well. Two of those three girlfriends' husbands also ride, so we've got a nice little cycling group. Road biking is huge in the work place. We jokingly warn new employees that if they don't already own a road bike, it is highly likely they will end up buying one soon.
My parents are another story. They are couch potatoes (I was raised as a couch potato), and they don't understand why anyone would do any physical activity for fun. In addition, they are always worried that I will hurt myself. They have no idea how much my bike cost and I intend to keep it that way, my Dad would flip. They also don't know that I commute, or that we go on really long rides on weekends. I'll just casually mention to my mom "Oh, we went for a bike ride" when she asks what we did over the weekend. She thinks its more like we rode along the 3 mile greenway where people jog and walk their dogs and kids. And that's fine, she can keep on thinking that. They both know I wear a helmet and that's all they need to know. The in-laws are a little more supportive, they understand that biking for us is a combination of social interaction, fitness, fun, and transportation.
The best part about going up hills is riding back down!