I chose to apply to UCF because I believe that I have the qualities that UCF is looking for.
Really? So, you applied to every school that might accept you regardless of whether you wanted to attend that school? Furthermore, how does believing this in any way distinguish you from every other applicant, all of whom undoubtedly believe they have the qualities that the school is looking for? So, you should not only develop a stronger opening, but you should also cut this line altogether.
I am also a stern person; I don't change my views on anything because someone pressures me to or because others think that my views are wrong.
Look up "stern." Are you sure that's the word you want here?
With all the qualities I have, I am also calm and collective.
Unless you have Dissociative Identity Disorder (a.k.a. multiple personalities), the phrase you want is "calm and collected."