You'll do much better at English by avoiding sloppy words like "wanna". Even in casual speech, it sounds childish and a little stupid. Sorry if I sound as if I'm lecturing, but I often see learners using lazy slang because they think it's "better" or "more authentic". It still sounds like poor English, no matter who says it.

We never write "wanna." It's only spoken. "Wanna" is how many native speakers (not all) pronounce "want to" when speaking at normal speed. Never write "wanna." It's not correct and the word does not exist. Always write "want to."

Yes, that is the difference. Also, "wanna" is never written, only spoken.

"want to" is proper English "wanna" is slang They both mean the same thing

There's no difference. "Wanna" is a slang. It basically means the same in many situations.