My ethnic background.

My parents are from a southern region in Spain called Andalucia. I think that their culture and their customs have influenced me a lot. People from Andalucia use to be very extroverted, with a great sense of humor and they are very religious and deeply rooted on agricultural traditions. It is said/believed that people from Andalucia tend to be very lazy ( I think it is not true), and that they love a lot establishing social relations with their community members, normally/usually in a bar with a cup of wine.
On the other hand, I have lived all my life in Catalonia, a northern region in Spain. Catalan people are totally different than Andalucian people. They speak different languages (in Catalonia we speak Catalan, as well as Spanish) TheyAndalucians/Catalan people(?) are really hard workers, open minded, with a great sense of responsibility and very enterprising. On the other hand they (they who?) are introverted, wary and we are said to be miserly/stingy(?) (this is totally false). They are very rooted with their own traditions and culture and most catalans consider that they live in a different country and they want their independence from Spain.

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Great job! On the very last part though, it was a bit confusing to figure out who "They'' were. Keep it up. :)

-costumes - disfraces

     My parents are from a south the southern region in Spain called Andalucia [or: Andalucia in the south of Spain]. I think that their culture and their costumes have influenced me a lot. People from Andalucia use used to be very extroverted [or: were very extroverted], with a great sense of humor and they are [or were] very religious and deeply rooted on in agricultural traditions. It is said that people from Andalucia tend to be very lazy (I think it that this is not true), and they love a lot [or: they especially love] establishing social relations [or: socializing] with their community members, normally in a bar with a cup of wine. 

     On the other hand I have lived all my live life in Catalonia, a northern region in of Spain. Catalan people are totally different than Andalucian people. They speak different languages (in Catalonia we speak Catalan, as well as Spanish). They are really hard workers, open minded, with a great sense of responsibility and very enterprising. On the other hand they are introverted, wary and we they are said to be miserly (this is totally false). They are very rooted with [or: deeply rooted] in their own traditions and culture and most Catalans consider that they live in a different country [or: consider Catalonia to be soverign] and they want the independence from Spain.

     Another interesting story Jorge. You don't need the preparatory phrases "On the other hand" unless you are making direct comparisons within the same sentence. Remember to try and keep the past and present tenses seperate when writing, unless a transition is formed in the story. 
     I'm studying Francisco de Goya for my World History class, and read today about him going to Andalucia with the Dutchess of Alba, who he desired to be his lover, but she'd have nothing to do with him. Poor guy.