>I don't know if you're brazilian or not

I'm actually portuguese, and also doing research ^_^

Look, you're living an hour away from a seven million metropolis, and you tell me you can't find people? I thought you were based somewhere in Roraima...

A quick google search issued websites of anime/manga/cosplay organizations, and a series of events related to it (listed at the bottom). Even if there is nothing taking place this week, you could at least mail those people to get to know in which shops they go, where and when do they meet, etc. Also, you seem to be basically lonely, so solving your relational problems will also boost your productivity and general satisfaction

Organizations:
http://www.rioanimeclub.com.br/
http://www.animecentereventos.com.br/
http://www.animeplanet.com.br/
http://www.anime.com.br/blog/

Found in http://www.oifuturo.org.br/patrociniosculturais2009/resultados.html
ANIMA MUNDI 2009 – 17º FESTIVAL INTERNACIONAL DE ANIMAÇÃO DO BRASIL | RJ | ARTES VISUAIS
Um dos principais festivais de animação do mundo, o Anima Mundi acontece nas cidades de Rio de Janeiro, Belo Horizonte e São Paulo, apresentando curta-metragens, longa-metragens, seriados e comerciais realizados em diversos estilos visuais, linguagens narrativas e técnicas de animação. Conta com o Anima Mundi Web e o Anima Mundi Celular. Realiza também o Anima Mundi Expo, promove a interação do mercado audiovisual nacional e internacional através de exposição, produtos e serviços e demonstrações de negócios

Don't forget people posting in fan websites and based near to you. You could contact them and get more tips about where things are happening near you, or have some kind of correspondence. Just as examples:
http://myanimelist.net/profile/Artemis
http://www.fanfiction.net/~akarichan

You get the drill, now go for it ^_^