@OP: I strongly encourage you to finish the tournament. You have no need to be embarrassed about your performance so far. All players (even titled players) have weak moments and must endure slumps. A score of 2.5 out of 5 is far from abysmal.
You lost some games, but you won some as well. The next phase of the tournament (even every game in a tournament) is a fresh start. Don't allow a psychological pall to hang over you because of past performances. The game's elite players know how to put such things behind them and become unflappable competitors. You can do this too.
All chess players--even the greatest grandmasters in history--are human. Committing blunders is not proof that one is unworthy to play! You had a few hiccups in the first stage, but that's over now. Maybe you won't be able to win the tournament, but you have much experience and education to be gained from playing the stronger players coming up. Embrace the opportunities!
Currently Im playing in my country's chess championship -the second stage- (the top ten after 9 rounds would qualify for the final stage where the winner would be the champion).
my rating is 1956 and now I have 2.5/5. I lost a winning position and another dead drawn one both to 2000+. I won one against an unrated player and the other win was by luck agianst a 1700 who was almost winning but lost on time. And finally my draw was against a 1750 when I should have won easily as I was a clear pawn up.
the tournament resumes next thursday. but I'm thinking of withdrawing from the tournament and I even have thoughts about quitting chess.
can anyone give me an advice on how to overcome this embarrasing start??