"If I told you things I did before/ Told you how I used to be/ Would you go along with someone like me?" I interpret these three lines as showing that someone had had a rough past but finds someone he/she really cares about. He/she is telling someone their past and hoping that that person does not leave them because of it because he/she wants to be accepted by this person. "If you knew my story word for word/ Had all of my history/ Would you go along with someone like me?" I interpret these lines with the same concept. I believe that this person just wants to open up to someone but they are scared that the other will not accept them and not like them because of what they have done in the past.
"If I told you things I did before/ Told you how I used to be/ Would you go along with someone like me?" I interpret these three lines as showing that someone had had a rough past but finds someone he/she really cares about. He/she is telling someone their past and hoping that that person does not leave them because of it because he/she wants to be accepted by this person. "If you knew my story word for word/ Had all of my history/ Would you go along with someone like me?" I interpret these lines with the same concept. I believe that this person just wants to open up to someone but they are scared that the other will not accept them and not like them because of what they have done in the past.