Born and raised about 40 miles east of Waco, then moved to West Texas around 6th grade, then the panhandle for high school.
That said: There's actually two areas known as central Texas - Waco claims to be central (when I was in Scouts, it was the HOT - Heart of Texas Council). but Brownwood claims to be the Heart of Texas as well. I'd define central Texas as a narrow band between say, 1-45and Brownwood (to include all of DFW metroplex) West Texas as between Brownwood San Angelo, Eastland, Throckmorton, and all points west to Lubbock, and north of the Hub City is the Panhandle, north Texas is from Throckmorton north to Oklahoma, including everything north of metroplex, South Texas is obvious, East Texas is everything east of I-45.