ココさんこんばんは!
ココさんは、ざんねんながら、知(し)っている日本人がほとんど誰(だれ)もいませんので 練習(れんしゅう)が出(で)来ません。(Because you don't know a lot of Japanese people, practice becomes almost impossible, desune.)

But it still looks like you are making some nice early progress. :=)
As Katherine suggested, 練習相手(れんしゅうあいて)がいない。is good I think.
Or, the one below which is a little complex but since you never know when you'll will have to start thanking someone for their help it may be worth the trouble to memorize.

(日本語の練習に)付き合って(つきあって)くれる相手がいない。付き合って is literally people that you are attached to, associate or just hang aroung with. 英語の 「 I'm proud of you 」 には、いろいろないいかたがあるとおいます。(There are a lot of expressions you can use for this).
A highly literal translation would be "Anata wo hokori ni omou (omotte imasu). But that is also very direct and straight so I doubt many Japanese find it completely natural. 両方(りょうほう)とも自然(しぜん)だし正しい(ただしい)
表現(ひょうげん)を考えさせてください。 Please let me think of an expression that is both natural and correct.

それでは、こんどは、訂正 (ていせい)も続(つづ)けたいとおもっています。I want to continue with the corrections next time. Please excuse me.

ごめんなさい。しつれいします。