This thread is a great idea! It's comforting to know that you are not the only one who hasn't everything figured out..
Worries: My first application that I have sent out so far (to my top choice, no less) could have been better than it was – I'm not sure if I struck the right tone in my SOP, as I'm naturally bad at writing those, and on top of that it contains a silly mistake. It's so small that you wouldn't notice it if you are not in the field, and even then only if you read it very carefully, but I'm afraid that it completely damages my credibility if they figure it out. Also, I have no clue how to finance my studies if I get accepted without a scholarship; the prospect of having to reject my dream programs for lack of funding worries me a lot and is a very real possibility. Sometimes, I even wonder why I bother applying in the first place...Finally, I have done quite okay so far academically, but I often fear that I will never be able to fulfill my family and friend's expectations this has created and that they will end up seeing me as a failure even if I end up in a position I'm happy with. Excitement: At least on paper, I'm a very competitive candidate: Strong grades with relevant coursework, strong results in the GRE, famous letter writers (moderately famous in the discipline, at least), relevant internship experience and so on. So at the very least, I hope I'm not completely deluding myself when I believe that I have shot at being accepted and getting some kind of funding. I'm also excited about the prospect of further studies: I love my field and I couldn't imagine doing anything else with myself, even if I don't end up at one of my top choices. I'm also looking forward to study in another country, meet new people and begin a new phase of my life.