Writing a JDate profile dictates that you need to self-promote, whether you are humble or cocky. You need to find your ego and exploit it for the sake of describing who you are to potential suitors. Too short of an “About Me” paragraph and JDaters may think you aren’t really into the process. Too long of an answer and potentials can get overwhelmed. There’s a happy medium of describing who you are with the right words and in the best way possible without being long-winded.
Wallflowers will have a difficult time with writing about themselves as shyness doesn’t translate well on paper. Being humble is a great trait, but why would I contact you if you’re too reserved to tell me about yourself? Don’t be embarrassed to say what achievements you’ve had in life thus far, or what your dreams are, or why someone should contact you. But if you’ve got a laundry list of reasons about why you’re the best thing since sliced bread… then you may need someone to edit on your behalf.