you mean, anatano tomodachi. 貴方の友達 您的朋友。

어제 我学了韩语中的点餐对话

어서 오세요.뭘 드릴 까요?
불고기 6인분하고 <strike>5병</strike> 콜라 5병 주세요.

it's 철이없다. and no, 철 doesn't mean 때문에 (not 땜에). 철이없다 just means "you are immature and childlike." on the other hand when you are saying "you are mature" you'd say 철이들었다 or 철들었다.

케이티(와 함께 한 날)~

어제 나는 케이티(네) 집에(서) 잤는데, (아주) 재미있(었다)! 우리(는) 많은 영화를 봤(다)! 먼저, 우리(는) "죽음의 고등학교"라는 애니메이션을  보았고, (그 후) 차와 나쵸를 (먹었다). (좀 지루해졌을 때)  (난) "(한국) 영화 보자!"다고 말했(다)! 그래서(우리는), 고사(와) 첼로 (그리고) 여고괴담5을 봤(다). 너무 무서웠(다)! (전부 벌써 본 영화들 이였지만 그래도 난 또 봤다). 아직(도) 무서웠(다). 나는 (새벽) 3시 까지 자지 않았(다)! 오늘 너무 피곤(했지만) (상)관없었(다)! 케이티(와 함께 즐거웠다).

what the above teacher has written would work when you are speaking to your friends using a script. 
But by the way you wrote the paragraph out in english, it sounds much more like a written diary so, what I have here is a typical korean school diary version of what you said, quite heavily edited but still trying to use 90% + of exact word choices you made.

I assume you learned most of your korean by watching movies and dramas, which I agree is a great way to learn a language; however, as you probably have noticed, there are downsides to learning a language that way and it is that you have either hard time learning or getting used to making use of the formal form of the language.

In korean written language, you never use 반말 (colloqial, common, informal talking).You wouldn't write " I hated that book because it was sooooo not legit with that dude in the story being hella retarded. In conclusion, the author is a $h!!@ty writer and this book is a piece of crap," in your essay, would you? I suggest when you are writing out paragraphs, you should get used to placing 다 instead of 어 at the end of a sentence. Also, you should definitely study hard in learning the 존댓말 (formal).

지원 화이팅!

Hello! I had that exact same problem except I was searching for Japanese. You are very smart for trying to look for video with caption in it. That method should definitely help you with reading later on. I found that Vikki.com is a website that has videos with captions in them... sometimes like 60~70%? I've been watching asian dramas for while and that's the best answer I can give you. I hope it helps

D!

B!

B!