Nine days of sweeping isn't much. Many people enter hundreds of sweeps daily for months before winning. Others win something after a week or two. If you are eager just to win something you may want to look for sweeps with lots of prizes and a short running period, or try some of the blogs if you like the prizes.
If you browse the forums, you will see all kinds of questions and answers, and you may be especially interested in the Newbie forum. One thing you will come across again and again is "patience and persistence." If you continue with this hobby, you will need those qualities.
About the "You did not win" email, I haven't seen too many of them.