like we say:
I gotta go .

Gotta means got to??
so isnt it wierd to say 'I got to go'.Shudnt we say 'I get to go'.
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Comments  (Page 2) 
whatchadoinDo people use them even in writing?
Yes, in informal writing — a letter or email to a friend, written dialog between friends and family in a novel, that sort of thing — but not in serious news articles or scientific papers.
whatchadoinWill I sound uneducated if I use them?
No. Not at all. Certainly not in ordinary conversations with friends and family.