This song is about "change for the better." This is the theme of the song because the first verse is negative, and the second verse changes to positive, It is the exact opposite. For example, the first verse says "I'm evil to the core
What I shouldn't do I will, They say I'm emotional" then it changes in the second verse to a more positive tone "I'm not evil to the core, What I shouldn't do I will fight, I know I'm emotional." This helps show two polar opposites of his life aka his low points and high points. When he says "I'm fairly local, I've been around I've seen the streets you're walking down good people now" this means he wants to help good people who deserve it, he wants to be around them and help them because he knows what they're going through. He changes from wanting to do negative things like break the rules, to wanting to help himself and other people. The theme that he is trying to convey is "change can be good."