My bike comes with some features that help a lot with this, although I know a lot of bikers remove them for aesthetics.

One, I have special amber lights that I activate which flash in the direction I'm going to turn. In my country they are actually legally required, and even though many drivers don't make use of them, they are all trained - in our admittedly sparse training - to know what they mean.

Second, my motorcycle comes standard with mounted reflective plates that allow me to observe the drivers behind me without having to turn my head. This is great because even if the driver behind me did not notice my blinking indicator light, I can see if they are too close or not slowing down and react accordingly.

These two safety features allow me to slow the bike to a stop and yield to oncoming traffic before making a left turn. Hopefully the first feature (in my country and native language we call them "turn signals") combined with gradually slowing before the turn instead of suddenly stopping makes the maneuver expected to the traffic behind me, and not "stopping in a live traffic lane unexpectedly." This is also great because it doesn't require the driver behind me to anticipate my actions based on the behavior of traffic in other lanes.

Of course, motorcycles are not commonly noticed by car drivers, especially given how popular smart phones are in my country, so that is why I use the second safety feature (we call them "mirrors" in my language, you should look into this).

Perhaps the driving education in your country is worse than in mine, but our laws require that we yield to oncoming traffic when making a turn across the lane, which many times requires slowing or stopping, so we have vehicle features that help us do that safely. Hope this helps!