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I'm sorry but man the lyrics are really like Starscream actually trying to make amends but due to his self destructive tendencies he keeps failing. He also wants everyone to know he is actually wanting to change but doesn't know how to.
"I swear, I will die trying" literally cannon because everytime he has changed or become a hero he dies, straight away sometimes.
"I'm not a good person, I'm bearly a person at all" cannon cause I say so and let me explain. He knows he's an asshole and sometimes he purposely acts like one for reasons. And in some of the darkest versions of Megatron's and Starscream's relationship he is quite literally a slave to Megatron and a "whipping boy" actual quote from Starscream and it makes me sick.