How to speak English fluently?

Correct: 

How do I learn English efficiently? Most of the time, I have no problem with writing English, but when it comes to speaking, I can't organize the words in my mind. I don't get many chances to practice speaking. For me, it's terrible! and I  feel  when it comes to learning English, this is the biggest challenge that I need to overcome. I don't know what to do. If you know of anything that can help, please share it with me. Thanks a lot!

Reason: 

How to learn English efficiently? (This is not a complete sentence) Many times I (always capitalize your proper nouns) know how to write it in English, (put a space after punctuation) but i couldn't  (This is the wrong tense for this verb. "couldn't" indicates a past action. It does not pair correctly with current moment of the verb "know" that you are already using in this sentence) organize the words in my mind when I was speaking English. (You should end with a period here) I'm always speaking it off and on. It's really terrible. So (It is generally considered bad grammar to start a sentence with a conjunction. You should have a comma between "terrible and so" or get rid of "so") i findd it is the biggest problem to me (No need to add "to me" if you already said "I find". This would be like me saying 对我来说 twice in the same sentence). I want to overcome it (In correct English writing you would need to clarify what "it" is here), but what can i do? (This whole sentence needs rewording to make sense) If you know how to do it in a better way, please share it with me. Thanks a lot!

Reading is a good way to learn proper speaking because you will learn sentence structure. It is also good to ask someone who understands English grammar why we speak the way we speak! (Surprisingly, many native English speakers do not use proper grammar.)