Completely blank...

During class Mark made a comment on "the world waits for no one", when hearing that I was completely blank I did not know what to think about what was just being said or was it that I was thinking too much that I did not know what to make of it.
I realized that I have four years of university to make the best of my knowledge in my future career, what I learn and take from the lesson taught to me is what will make me different from my competitors. Thinking that in four years I would be graduating and starting a new adventure in my life, I hope that I will make the best of my four years and that I do not waste my parents effort and faith in me.
Where do I see myself in 4 years? hopefully I would be graduated by that time and starting my life career as a Public Relations representative for the marketing industry or media communication field. The reason as to why I choose media as a field is because I enjoy human interaction and pleasing my clients; I enjoy inventing new ideas to improve my product/client. I remember watching the show "Sex and the City" and "The Hills" I was so fascinated by the lifestyle that these PR girls lived, maybe thats part of the reason why I became so interested in the world of media.
Even though I know what I want from my future, I am still terrified if I could achieve this goal. I keep asking myself "what if I don't make it?" What if no matter how hard I work for my future it may not be enough to succeed. I feel completely blank, completely terrified of my future.