Earlier quoted context omitted.
I recommend you to use web.whatsapp.com then, it's pretty decent now (except that it does not support calls)
That needs whatsapp running on your phone to work as far as I know (because it basically runs the communication on the phone and then syncs that to the browser)
Multi-device [1] which is now in beta lets you use WhatsApp on the web without the phone connection.
[1] https://faq.whatsapp.com/general/download-and-installation/a...