I haven't surfed north of the Golden Gate Bridge at all. I think your experience is probably due to you going to a break with a lot of longboarders. There are some breaks around Santa Cruz where longboarders coalesce around one peak while shortboarders congregate around another. Sometimes, very very rarely, you'll even see SUP riders find a section to themselves as well. I think you just happened upon a longboard spot and took out a shortboard. From my experience, that kind of situation often leads to no waves for the shortboarder. This doesn't happen to longboarders Muahaha

. . . er, unless they go out with 40 SUP riders
Anyway, I don't think the waves had much to do with your experience. Any time you go to a break for the first time, you're going to feel like you don't know what you're doing because . . . well, you simply don't know the spot. In other words, even if you had had a longboard at the spot you went to, it probably would have still felt off to you. I have spots I go to maybe 5 times a year and I often feel like my sessions at those breaks are a little weird because I have to reacquaint myself with the place. As far as the difference between Norcal and Socal goes, I think it's silly to reduce things to generalities. I hear some people make the distinction that Northern California is more about "soul surfing" and SoCal is more about shredding. My own experience, however, is that Norcal is chill and SoCal is usually hyper aggressive with sprinkles of toxic localism (that prejudice is based off experiences from decades ago however. Things are probably different these days. Honestly though, I'm just not much of a fan of SoCal.). I did meet a Norcal surfer the other day who had been down to SoCal and complained that guys in the lineups down there were douches. SoCal, of course, gets a lot more of the German tourist surfer who just has to get some sun on his vacation and, thank goodness, decides to go to SD and to skip anything north of LA. That probably won't last too much longer unfortunately. I do think the waves are better in Norcal, but they're also often more treacherous.