that comment hurt my feelings.
but its not a serious, grave kind of "hurt feelings". more like "yeah, be like that la izzit" if i translate rather loosely.

Hmm... I'm not good in Japanese though, strangely enough I somehow *understand* it, so let me try to translate that:

つかれたね
That was tiring.

いまかなしいよ。だれがわかりますか
I'm so sad. Who can understand me?

ここのてんきはほんとうにあついです
The temperature here is so hot.

今日は何をしたいか。。
What do I want to do today?

みんなさん、ありがとうございました。きのうはたのしかったです。
Thanks everyone. Yesterday was fun.

さびしいです
I am so lonely.

私はよいカメラマンじゃないよ。。
I am not a good cameraman.
idk, but if you encounter those sentences a lot of time then tat not a lot..
The way I do is learn katakana, then hiragana, then japanese grammar, and then I start reading. 
Yeah, everyone should be able to understand that. 

あの日に帰りたい
means "I want to return to that day"
yes

あの日に戻りたいすべてが始まるの日。
"I want to return to that day, the day where everything begins."

This 1 i not too sure how to make the sentence nice, somebody plz help
"I want to return to that day where I hoped it'll never ends."
ya, correct..

let see the sentence ...kinda complicated the english..

私は　あの日　に　帰りたい。
i want to return th that day

私は　あの　ぜったい終らないの日　に　帰りたい。
i want to return to that never ends day.

私は　あの　きぼうされた　の日に　帰りたい。
i want to return to that hoped day

私は　あの　きぼうされた　の　ぜったい終らない　の　日　に　かえりたい。
i want to return to the day where i hoped it will never ends.

is that correct?

sabishii  = sad, lonely

but many japanese like to alter the b with m, =samishii
(heard a lot  in songs)
dunno why
maybe sounds moar cool
i only know hiragana n katakana, dont know the kanji for sabishii, kimi.(leave that to the pros  )

btw im self learning, most of my resources r from the internet like this forum and of course anime, dorama, songs.... n i also learn a lot here.... from the sempai (dopod, sai, oneeleven(long time no see him  ) )

このばんぼんおどりへいきたいか
konoban bon odori he ikitai ka

should wrote like this:
今晩の盆踊りへ行きたいか？
konban no bon odori he ikitai ka
wan to go tonight's bon odori?

おげんきですか- ogenki desuka [how r u]
新年おめでとうございます。-shinnen omedetou gozaimasu [ happy new year]
がんばってね! - ganbatte ne [work hard/(add oil)]
じゃ、さよなら -jya, sayonara -[ k see u( bye)]
たのしいですね - tanoshiidesu ne [ its fun isnt it]
わたしはいまねたい、おやすみなさい -watashi wa ima netai, oyasuminasai [ i want to sleep now, good night]

i believe if u try to learn the hiragana writing + listening n watching anime u can
easily handle well for the japanese language in reading 

shin nen akemashite (新年あけまして)
ehem to celebrate 21st century, we say 二十一世紀あけまして!

君が幸せならば,俺も幸せ (kimi ga shiawase naraba, ore mo shiawase)

Why did you choose to use 'ga shiawase naraba' instead of 'wo shiawase sureba' ? What is the difference?

because the second person is not searching/doing happiness, he/she has it...

"o" particle must be accompanied by verb. the second party is not doing anything at all...

yea, and the 'wo shiawase sureba' should be corrected to 'wo shiawase ni sureba'
basically it will mean like this:
kimi wo shiawase ni sureba = if i made u shiawase