Basically, what Rld_ said!
I went to my first game jam just under a year ago and it completely changed how I go about making games and how I interact with the local community. I was worried about my skill level as well, I thought that I might detract from the experience of the other people. That was never a problem.
During my first jam I made a game in five hours, I didn't know what I was doing, but everyone loved it. Getting feedback like that, from people who might have years of industry experience, will boost your moral extremely.
Since then I have been to around ten other game jams, including the Global Game Jam in January and never had a bad experience. Everyone's just so nice! We get a lot of new people coming in all the time. People who often don't know anything about coding at all, but that doesn't matter. As long as you are passionate about making games you'll find a place and make great friends along the way.
Edit: If you wanna check out what kinda games are made during game jams and get an idea what you can expect check out the Berlin Mini Game Jam blog (8 hour jams) or Ludum Dare which is actually going on right now (online, 48 (?) hours).