You're a young sparkling that was forgotten by your carrier when your clan fled a oncoming battle between the autobots and decepticons. You had been left during the battle of ibex springs. You were just a little one, small, malnourished, and injured with a twisted wing. However for some reason lord Megatron decided to take you in, be it wise or foolish.
Eventually you survived your injuries after a IV of innermost energon from a rainmaker, and Knockout's brilliant casting to redyna your wing strut.
But life didn't just begin after that for you. Any normal 'con would assume you'd be given to a faction member who wanted a sparkling or had lost their own during the first riots and chaos. But for some reason... Megatron assigned Shockwave to take care of you.
He must have done something right, because your still alive as a young adult cybertronian