This is all too common for a first time out. The absolute key, especially until you're out of rookies, is to anticipate bonehead moves like that. If you expect the worst from everyone out there at all times, you can avoid most of it by sacrificing a little pace here and there. The second you start counting on people to do what they're supposed to do, you're in trouble. Voice chat is key as well, a simple "going left" over the mic can save a lot of trouble.
Rookies and D are, rather unfortunately, about survival. Sacrifice a little pace, and worry more about those around you than yourself. Once you're up in B, A or pro the racing and racecraft is leaps and bounds ahead of anything other sim imo.