I can imagine how you feel and of course a game jam is not for every game dev. Personally this is my first game jam and as for me it's exciting. You don't have to make a perfectly polished game. Just do it and have fun!
Perhabs it is very important for you to win this jam. But in my opinion it isn't. Probably I wouldn't create this game if not for this jam.
It's the experience you gain. You gain experience with every game object, line of code or visual node you add to any project. And if you get some feedback, it is icing on the cake :)