I know the feeling only too well, and I've been driving for about 50 years!
I am short too, and have difficulty maneouvering in tight situations including parking in my street where none of the homes have their own drives.
You need become familiar with the sight-lines in your own car and with using your mirrors, and have lots and lots of practice. it is that practice with mirrors that allows the drivers of even huge lorries to reverse them accurately into narrow spots.
I'm reasonably used to my own car, which is short and narrow with a fairly boxy shape and vertical back end (a Renault' Kangoo'). A cushion helps but is not ideal. If I had to drive one of the larger saloon-cars made now I would struggle with it at first.
