Get a grip and join up. They will not beat shite out of you for fun. The whole idea is to promote confidence and enjoy the experience. Give it a go. I wish I had done it in my younger days.
Don't be! I'll guarantee you that every person in there will be more than accepting. They understand that everyone has to start somewhere and they've been there too. Go and talk to them! I promise you that you'll quickly learn that they are all good people.
Don't be scared, prove yourself in performance and diligence. If you walk in there confidently and are awesome at it, no one can say a word to you. Don't be intimidated by older guys, everybody gets nervous, even them.
Well today I walked down to martial arts (karate) and I'm a naturally shy person, but I walked down there and saw a ton of older guys and got scared so went home. I want to do this so badly , but I'm too scared to do It, I'm 14 btw. But now I feel like a coward and i was excited for this all week long! :(