Answer 1

If you take it step by step, it won't be that hard.
Plus, look for courses specifically on Unity C# ;-)
Programming in games is not the same as programming in general.
(Although going through the basics will definitely help you in the future, and this can be done on SoloLearn)

Answer 2

you are on a right place!
you can learn c# programming language from the beginning.
just don't give up! you already have a dream and possible a plan...

if you will stuck, ask a question with relevant tags and show the code...

Answer 3

Have you begun with the beginner's course here?

https://www.sololearn.com/learn/courses/c-sharp-introduction

If you have questions, ask in the comments or in your feed, or search the Web. You'll get there!