"got2b" ...blah... sms-ese. :P "Got to be" is a shortened version of "I've got to be...", which is an obligation to be something (or a need). You can't put "get" in its place because the meaning changes into an opportunity. Sorry to tell you, but the word "get" is common and complex at the same time. You've just got to get used to its many uses... you can't get it from the get-go. No simple answers here. Kylie has obligations/needs too... https://www.youtube.com/watch?v=yYV_jelnZdE