Yes, schwa sounds the same in all those words, and pretty much the same everywhere.
You will progress better if you try to use proper English - it's expected here. I'm not referring to mistakes - everyone makes them. You need to capitalise 'I', 'English', etc.
/wanna/, if you've decided to pronounce it this way, is still written "want to". /gettin'/ is written "getting" in proper English.
You'll see all sorts of weird inventions on the 'net. Only some of them are English.
- For Teachers