"Wanna" and "Want to" mean the same thing, "Wanna" is used to represent the pronunciation of "want to". It is very informal. I'm not a native speaker, but I wanna try to answer this question. (Informal) I am not a native speaker, but I want to try to answer this question.

"Wanna" is the phonetic (spoken) equivalent of "want to". It is extremely informal and should not be encouraged except when speaking very quickly. Please note that "wanna" should NEVER be written. If you do write it, we may assume that your English is terrible or that you were badly educated. I tell my students to avoid using "wanna" (and "gonna", "gotta", etc) at least until they reach the level where it comes naturally in their speech. And if I ever saw them writing it, I would give them a big telling off!

"Wanna" is the phonetic version of "want to" or "want a": Written as it sounds. Bad news: grammar rules still apply for "wanna" (and gotta, gonna, etc)! If it's "wanna" as in "want to", then you must follow with a verb. Sounds obvious, but I've seen this mistake before. :) Also, if it's "wanna" as in "want a", remember you've just given us the indefinite article ("a"), so whatever follows must be indefinite. Eg. "I wanna biggest ice cream you have" makes no sense even in slang, because you're basically saying "a biggest ice cream" when it should be "the biggest ice cream". Messy? That's what we get for squashing two words into one! Important: never, ever, ever write "wanna" in a proper sentence. It looks like you failed English. ;)

"Wanna" is a slang word for "want to" and is the same thing. Don't use this in an English class haha.

They mean the same thing, "wanna" is just a slang/colloquial form of "want to". When spoken fast, "want to" sounds like "wanna". want to = wanna going to = gonna got to = gotta