Oh dear. Glad you are OK, bikes are easily replaced. First rule of filtering is that you need to be aware of what others are doing at all times. But you know that now. The insurance companies will probably go for 50/50 unless the police think you were riding dangerously, though they will probably not get involved as you "have learnt your lesson". Always difficult at junction but you could/should have expected a vehicle to turn across your path and be prepared to stop. Often hint is gap appearing in cars ahead of you with the cars allowing a space for vehicle to turn across, especially in queue of traffic.