自己紹介, Corrections!

[kayuu]

ケイティといいます。でも、マッカと呼んでもいいです。自己紹介を書くのが下手です。２１歳です。さきに大学を出ました。大学のとき、コンピューター・サイエンスを勉強しました。今、家で仕事をします。ウェブ・デベロッパーです。ひまの時に本を読んだり、ゲームをしたり、写真を取ったり、外国語を勉強したりするのが好きです。人並みです．．．．．．人並みのギークです！

I put this on my 'about me' page on my blog, and I know it's quite basic Japanese but I was wondering if anything I wrote didn't make sense or was plain wrong, or if there was a more natural way to say anything.

I was trying to say something along the lines of; "My name's Katy, but you can call me Macca. I'm bad at writing self introductions. I'm 21 years old. I recently left university. When I was at university I studied computer science. Now, I work from home as a web developer. In my free time I like to read books, play games, take photographs and study foreign languages. I'm pretty average... for a geek."

[NileCat]

はじめまして、マッカ さん！

Your Japanese introduction is good. Friendly, polite enogh, and I like "人並みのギーク".

さきに大学を出ました。sounds a little bit vague.　最近（さいきん）かな？(さきに is not wrong, but it sounds too proper expression for a casual writing. kind of old, and a bit trite here, I'm afraid)
ひまの時に本を読んだり、→　ひまな時に　sounds more natural.

That's all.
Hope it helps

[kayuu]

NileCatさん, どうもありがとう！