Life in here in Singapore (where is here?)

Today is really a/a really  sunny day (what is this 'really' doing? does it mean very sunny, or does it express surprise that it is sunny?)  at here (it is not normal to have 'at' 'on' 'in' prepositions with 'here', or 'there') and although I have already been here for half of the/this a year, but I am still not adapted/accustomed to the life here. It is really (same question about your really - does it mean 真的 或者很？） a really big challenge for me to find a good job in here. I am very shy, so that I don't have the bravery/courage to speak English to people face to face with people (try face to face with cats and dogs then! 哈哈）.
Anyway, I will try to make friends in here in Italki（ah! maybe this time you can use 'in' - it refers to Italki!  but it would be better to say 'here in Italki) and hope everything would will be good. Good luck! (For whom are you wishing 'good luck'???)

Today really is a sunny day

Today is a really sunny day

It really is a big challenge

It is a really big challenge

Today is really a sunny day here. I have been here for half of a year, but I still have not adapted to life here. It is really a big challenge for me to find a good job here. I am very shy, so I don't have enough bravery to speak English to people face to face.
Anyway, I will try to make friends on here and hope everything will be good. Good luck!

Good job!

Life in here

Today is really a sunny day at here and . Even though I have been here for half of a year, but I still not haven't adapted to the life here. It is really a big challenge for me to find a good job in here. I am very shy so that I don't have brave am not brave enough to speak English to people face to face.
Anyway, I will try to make friends in here and hope everything would be goodwill go well. Good luck! (最后一句是对的，但是我觉得“wish me luck"更合适。)

加油啊！你的英文已经说得很好！你坚持勇敢地说就很容易地交朋友！