我介绍一下我自己

我学习中文两年了。不过我没有太多常谈聊天。我想italki可以帮我。 

It not so complicated in fact,haha!  (◕‿◕✿)  “我介绍一下我" is OK .. I also use this kind of grammar，LOL. Just say:"我介绍一下我啊(let me introduce myself,ahh...)" or "我介绍一下我先(let me introduce myself first)"  

And "不过我没有太多谈天" can change to "不过我没有太常谈天”  still right.. (๑•́ ₃ •̀๑)

Have fun while learning,it won't be rigid and inflexible. (≖ ‿ ≖)✧    You must love the game "Uncharted2" so much, by the way have you ever played  "inFAMOUS" and "journey""flower""kill zone" "GOD OF WAR"  "heavy rain" "Rachet and Clank"and others PS3 exclusives ? my favor games are Assassin's Creed and Left4dead,portal2,Limbo,Metro2033.  

                 我介绍一下我

我学习中文两年了。不过我没有经常联系说中文。我想italki可以帮我。

我介绍一下我    自我介绍/ 我介绍一下我自己（when u want to say introuce yourself, just use "自我介绍". Your sentence does not have any grammar mistake but we do not say like that in chinese. "我介绍一下我自己" means "let me introduce myself"）

我学习中文两年了。不过我没有太多谈天  不过我很少用中文来与别人聊天（if u want to explain that you don't usually talk in Chinese, I recommend that you should say "不过我很少用中文来与别人聊天". "与别人聊天” means “talk with others”， Chinese people donnot use "谈天" but "聊天"）。我想italki可以帮我。

I hope my sugguestions can help you.^^

我介绍一下我自己

我学习中文两年了。不过我没有太多谈天使用它（中文）的机会。我想italki可以帮我。

我自介绍一下我 or 我介绍/我自己/一下

我学习中文有两年了。不过还不可以我没有太多谈聊天。[I assume you are trying to say, "However, still I can't chat in Chinese]我想italki可以帮我。