I scored a double hundred in the fifth match of my test career......it was also my maiden test hundred....i scored 204 in that innings......who am i?

Brian Lara scored 204* in his fifth Test match against England in 1993-94, which was indeed his maiden Test century. This made him the first batsman to score a double century in just his fifth Test. Sachin Tendulkar's first Test century came later (119 runs in his 17th Test), and Wasim Jaffer is not associated with this record.