Yes it is comfortable to hear it spoken that way. Most of us say "wanna" for "want to". Its a bit lazy but completely normal.
It is less comfortable seeing it written. I'm not so young any more, and I would never write "wanna" unless reporting speech, and even then rarely.
I feel much more uncomfortable seeing people here asking about "smth" or "sth" or whatever it is they write for "somebody". That isn't how we say it, but perhaps it is a texting thing, and younger people feel differently. I don't know.