Google announced that with the release of Chrome 68 in July, all HTTP sites will be marked as “Not Secure” in the URL bar. This will look like the following –
Earlier in 2016 Google started showing “Not Secure” for the pages that require user data. That means if a page has login form or contact us form chrome will show “Not Secure”. There are so many arguments on the internet of forcing to HTTPS, but I will suggest you to check this article, I hope your confusion will be cleared.