Guys! Is this normal? Help me please.

Do you use FB Messenger? That and disqus kills the battery on my Icon in a couple of hours when I use it actively.
 
Well, check for the synchronization settings of your mail account, prevent here apps to work in background, and in some extent, all app that doesn't need to work in background (if you do not use notification or live title for an app, there is no need for it to works when not launched).

But mail sync' could do a lot. Once per hour is ok. "At the mail arrival" setting is just battery killer.
 
I installed it but I don't really use it..I frequently use whatsapp though

WhatsApp is quite the battery hog as well when in use (seems to be ok when just in background), at least on my phone. 19 hours with frequent use of keyboard and messaging doesn't seem bad, actually.