Don't worry, most of us have felt like that at some stage... Several stages in my case!
Keep on, focus on improving the area you have been weak on in the sim, push through and in a few months you'll be wondering what you were fussing about.
It is just a little bump that you will get over, and life will be a little sweeter because of it. After all if things come too easily, we tend not to appreciate them as much. This bump will help you appreciate it all the more when you pop out the other side and start flying the line.
Chin up 😉