Just be be friendly and talk to ppl, I guarantee you'll make some friends, conventions are first and foremost about the social aspect of anime, video games and just geek culture in general. In my personal opinion going to a con cosplay or not is better than a birthday, Christmas or any other holiday combined! It's a chance to be around like minded individuals who share the same intrest/hobbys. Just go and see for yourself, you won't regret it! =D