This is an interesting topic. Ive usually had friends that are into cars, and friends that know how to work on cars, but most cant really keep up with the pace I keep while wrenching. Im usually the one helping everyone else out, and seeing my project covered in dust in the corner. Ive always been around older car guys (im 25 now, most of these guys are in thier 50's and 60's now) so I learned a whole lot at a young age.
My dad has been the influence/huge help since I was little and wanted to learn about everything with wheels. Ive taken alot of knowlage and work ethics from him, and sometimes his tools too (haha) I think without him around, I wouldnt be into cars at all. He is one of the few people who I can wrench with and not get fustrated with.
As for the car clubs.... The only ones ive found worth while, or 'fun' to be in seems to be the vintage racing clubs. Ive met alot of really cool people who would help me if I asked, and who are the first to throw me a beer when I can help them out a bit. These guys actually use thier cars, rather than go to the drive-in, eat burgers, and shoot the breeze while staring at everyone elses rides.