Student or Learner
We use this slang "Gotta" which it means have got to OK
but what i know .... we use v3 "Past Participle" after "have".... like i have seen , have been
why we don't say i've gotten to go??
"I have got to go" is analgous to "I have to go", and "I have gotten" has a different non continuous (inchoative) aspect to the verb.