science of psychology
Psychology is a science. It literally means "the scientific study of the human mind and its functions."
You don't need to say "science of psychology"
was very different than what I had been expecting
Don't include this if you aren't going to explain it.
I hope to be able to explore this career pathway and discover if this is something I want to pursue as a career.
"I hope to explore this career pathway."
The second clause gives the same information as the first clause, except it is wordier.
it still fascinated me
I've always been fascinated with the art of filmmaking
1) Think of a new word
2) "art of filmmaking" is similar to "science of psychology." You don't need to include the "art of."
I've also always had an interest in theater, which is why I was so drawn to NYU, because I know how seriously the arts are taken there
You need to explain this. (Show, don't tell!)
So if accepted I'd plan to participate in the College of Arts and Science Theater because I would still be able to explore my love of theater as an extracurricular activity.
1) This sentence is not focused.
2) You need a strong conclusion and a concluding idea.
"I plan to explore my love of theater by participating in the College of Arts and Science Theater."
You still need a final idea.