If you are writting it in past tense which I think you are, then these are some corrections :) I also tried to make the scentences flow better and sound more natural.

My day

Today is the weekend,I got up very late,
今天是周末，我起床很晚

I had my breakfast at lunch time,
我在午餐时间吃的早饭
Then I spoke English to my foreign friends all day
一整天都和我的外国朋友用英语聊天

I find speaking a foreign language is amazing just like magic.
我发现外国语像魔法一样有趣

I love it alot.
我非常喜欢它

But I'm not young ,I want to learn twenty words a day.
但是我现在不年轻，我想每天背诵二十个单词

The words I learned today will forgotten by tomorrow.
如果我今天记住了，我明天就会把这个单词又忘掉

I'm going crazy~
我快疯了

My day   weekwend 

To day Today  is weekend,I get up very late, 
今天是周末，我起床很晚

I have a my breakfast at the lunch time, 
我在午餐时间吃的早饭

All day talking with my foreign friends in English  //Talking with my foreign friends in English all the day .
一整天都和我的外国朋友用英语聊天

I find a foreign language like magic is amazing,

// I find that the foreign  language is so amazing just like magic
我发现外国语像魔法一样有趣

I very love it very much
我非常喜欢它

But i'm not young ,I want earning twenty words every day
但是我现在不年轻，我想每天背诵二十个单词

But if i remember the words today I will be foget it tommrow 

// then they  will soon be forgeten tomorrow
如果我今天记住了，我明天就会把这个单词又忘掉

I'm going crzay~
我快疯了

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同是英语学习爱好者，能力有限

比较明显的地方帮你修改下 改得不对的地方还请不要见怪。: D

其他地方可以等其他网友帮你看看