介绍我自己

大家好。

我叫韩倪柯，我是二十岁, 我[In Chinese, pronouns are omitted when the context is clear]来自瑞典, 不过現在而且住在西班牙的一个小岛上。我的爱好是学外语是我的愛好, [vary your sentence structure so that it won't looks boring.  I know you are learning Chinese, but just to alert you a better way to write etc.  I'm sure you won't write in this way in your native tongue. As an adult we learn languages differently.  Translation is one of the better ways to achieve our thoughts; they are language independent] 比如中文，法语，越南话，广东话而且还有泰语! [I would write like this to prevent denigrating Vietnamese into a dialect... 中法越泰語而且还有广東话.  As for Cantonese, they themselves consider it a dialect of the Chinese language (not Mandarin!  It's just another dialect that has official status as the common language.  Cantonese lost to one vote being the language of the land :(  ] 我没有很多中国朋友所以我在这个网页练习我的中文。认识你们，我很高兴能认识大家。[大家 is more polite than using 你们 for it can sound like you are above them.  By including yourself in the group, you imply you are just "one of us boys".  This is cultural difference and preference.]

The mechanics of your Chinese is good.  I cannot help if I can't understand in the first place. To be good in any language, one must also know its traditions, culture and the preferred way of expressing things.

介绍我自己

大家好。

我叫韩倪柯，（我是）今年二十岁。我来自瑞典，但是现在住在西班牙的一个小岛上。我的爱好是学习外语，比如中文，法语，越南话，广东话（还有）以及泰语。因为我没有很多中国朋友所以我在这个网页练习我的中文。认识你们，我很高兴能认识你们。