Re-learning how to corner aggressively at speed after bad experiences I'm not quite sure if this should somehow be broken up into two questions, but what can one do to take sharp corners at speed effectively, especially when you're nervous after having bad experiences riding?
I'm already familiar with common techniques for high-speed cornering on a theoretical level (cf. a video from the Global Cycling Network), but I was never really good at taking corners hard. Now, however, after being in an accident with a car and afterwards having only ridden a lot in miserable conditions (snow, ice, sand/gravel on the road because of the snow, etc.), I realize that I simply don't do sharp turns... and trying to force myself to do it makes me extremely nervous.
Possible aggravating factors

Ill-suited bike: Perhaps it's the one rideable bike I've currently got? — it's a lot lighter and &quot;tighter&quot; than my previous training bike, which makes it seem fun to ride, but it just feels squirrely... yet that could simply be me not used to it.
Interference from similar sports: Between the accident and the winter, I was on a motorbike quite a lot, and I feel much more confident on it than I do on a bicycle despite going over twice as fast. However, the thing weighs 220kg as opposed to maybe 13kg, and you hug a motorbike in a way you don't/can't on a pushbike. Also, when cornering on a motorbike, it's completely normal to use the rear brake to control your speed; I find I'm instinctively trying to do this on a pushbike but it just makes me feel weird, and I don't even know if you can do this safely on a bike, anyway

Are there no &quot;baby steps&quot; I can try to do in order to get myself to corner properly and aggressively and yet to trust myself/my bike at the same time?
I'm only posting this as an answer because it seemed long to comment. 

But i would run some drills maybe once a week or whenever your free time allows. Go to a sports store and get some little multi sport cones, or use beer cans or toilet paper rolls or what ever else you have that won't hurt you or the bike if you run it over or fall on it. 

Two drills that may help is a large slalom where you need to tightly weave back and forth. The other being a large circle. 

Start with ample room where it is almost too easy, then as your confidence and speed increases, decrease the size of the shape or row, there by increasing the angle and lean that you need to use. 

You could even go as far to set up a small sprint course either in grass or a parking lot depending on how you feel, and start tracking you time. That way your not racing anyone but yourself and your own head. 

It may take awhile to build confidence but repetition is key, after a while that fear should slowly start to shrink. Likely you have some degree of PTSD from the event, some may think it's silly but its very real. I was in a head on 60mph collision (in a car not a bike) about 6 months ago, and unfortunately have to drive on that same 2 lane strip everyday to work, and still i get anxiety going through there, it's a 2 lane underpass, old road so it's narrow, with guard rails on either side so there is no where to go. Guy came into our lane and there was nothing we could do but wait to get hit. Point is, it gets better it just takes time and repetition.  

I have also found it helped my cornering a lot to concentrate on my position relative to the bottom bracket, sounds goofy but consciously being aware of my bad form and working on it with similar drills helped me gain a lot of confidence, i had similar issues when i switch from a 2.35" mountain bike to a road bike, just didn't feel right.