Although my GPA may not be to the standards of Boston University, I believe that I will be able to reach my full potential if I attend such a prestigious university. Rather than ignoring my schoolwork as I did my first three years in high school, if accepted, I will take advantage of the great academics and utilize them to help advance my career goals.
It is recommended that you do not provide reason for colleges to doubt you. If you don't have confidence in yourself why should they? If you wish to bring up your 'faults' (which you don't have to, because they can see that on your transcript) you should only do so if you provide valid
reasons or circumstances explaining them, rather than coming off as lazy by using an
excuse.
The rest of your essay was sound, I would jus highly recommend taking or revising that part.