Hello people!! thanks a lot for being here trying to help with your knowledge 
I have a question, I don’t know when may I use the question particles “doushite”, “naze” or “Nande”, them all mean why but, what’s the difference?
In the lesson they’re used equally…
Thank you!!!
No difference. It is like “why”, “how come” “for what reason”. The more you get exposed to Japanese the more natural these words will become.
I’m not a Japanese native speaker so I don’t have a definite answer, but a Japanese friend once laughed at me (jokingly) when I used “naze” in casual conversation. He said that I should use “doushite” or “nande” in casual speech because “naze” is a bit formal. I think that the level of politeness is the only difference though.
Hi, I’m here for a native point of view.
As Steve said, no difference in meaning.
In a mean time, like benhenschke said, I’d use doushite or nande in casual conversation with my friends.
If I’m in more fomal situation, I’d say naze-desuka.
Above all, don’t worry about it because it doesn’t really matter and I’ll understand you perfectly well 
Thank you!!! ^^