Reinvent my self

I am going through a stage in my life where I dont like to work with everyone today in science I said somthing that may have hurt someones feelings and I wasnt trying to, it just came out in a way that sounded hurtful my teacher called me on it and I felt so stupid for saying such a thing but what my teacher told me really made me think I am trying to reinvent my self not for others but for me and just like most student people are trying to change from the savages they were last year but they still go back to there old ways. I have my days where I am out of line I am still trying to change...... whats your reason behind those days where you are wrong like 2 left shoes and totally out of line????