Caita Cat, I was like that at my first con. My first was JACON 2003. I was embarrassed around the cosplayers and nervous around the otaku. However, once I got used to it, it turned out to be one of the best things I've ever been to.
Anime cons are one of the few things that can get you around other people with the same interests as you: anime. There are TONS of activities, events, guest stars, and things to buy.
I wouldn't mind helping you out. I will probably be cosplaying as Naota from FLCL, so look for me...and no, I'm not 30 years old or anything. I'm probably younger than you are. (If not, then I'm DEFINITELY shorter than you!

)