It's something new to you. As FizzyWater and carld say you aren’t going to notice it for long.
If you think about it, reading a paper book is worse.
1- Your eyes are down on the lower right corner.
2- You have to take the page from the right side of the book and move it over to the left side.
3- Fingers from both hands will have to be repositioned.
4- Now you have to focus on the top left corner of the book.
How many pages are in the book? Yeah. you're going to have to do it a lot.
An ereader is simpler and faster.