Please use a proper username so I can greet you properly.
- Before commenting to the grammatical problems, I would like to say that your essay was TOO SHORT and not developed well.
- Use your chance wisely to make the words up to 300 or nearly 300.
- your essay need more elaborations, especially the idea on how you strongly hold your belief and how you HAVE DEMONSTRATED in your actions, which means, something that you HAVE ALREADY DID.
now about the grammatical problems:
in academic writing, avoid the usage of apostrophe, if you write "I have" do not write "I've".
why plural? what for? so you study over and over again? many times? in many universities?
I heard from my friend that one of my friends were saying that I was all talk
this sentence does not sound like "English", it is more like your native language.
I once heard a great quote
I want to live an extraordinary life and I believe by applying to NTU, I will be one step closer to my goal.
what kind of goal? no elaboration
You need more practices, please read more examples about this, I am sure that there are so many examples out there that you can take as a guidance, not to copy and paste it.
Keep trying and good luck!