Yes it is normal.
SIMPLE - You need to appear at number 1-3 in google search results for most of your keywords
Improve your ctr people are seeing it but are not clicking it
4% isn't entirely bad
Check the top 10 ranked sites for your searches and make sure your titles and snippets are as catchy as theirs. They likely got the top CTR.
Thanks for this, i am presently working on improving the titles of all the content i posted. I noticed a big change, some of the keywords are already ranking on page 3.