What is the difference between whatever and no matter what?
Can I say be yourself whatever happens or be yourself no matter what happens.

Question

Answer

Whatever: can be defined in two ways 
1) example: "whatever happens"
meaning: if anything happens.............whatever in this sense means that anything and everything

2) example: " I don't care, whatever!"
meaning: when you do not care about the subject of topic.

No matter what means that if anything happens

example: "no matter what, I will be there"
meaning: if anything happens, you will be there

Answer

No matter what happens, be yourself.