my wishes in 2013

There are a lot of things is very important for me i did in 2012. (turn the sentence around so it is more natural)  I did/achieved a lot of things in 2012 that are very important to me

Although my work took up a large part of my time, and meanwhile at the same time i had to manage squeezing to squeeze in some time for learning study something. It's was a fairly busy year for me, but what i got from it was more than i could had expected thought. So everything i did was worthwhile and meaningful., aAnd I'd like to give an show my appreciation to my boss who gave me a lot of new responsibilities to me, which made me meant I had no time to look for a boy friend, but which meant I also gained so much many cherish valued experiences from it in the last three years (you only mentioned 2012). Thank you very much my strict boss, i would really appreciate it if you can cut down some of my work in the new year even though i know thats impossible! 
So my only wish in 2013 is that i wont be freaked out by my work.

Punctuation -space after comma, fullstop - capital 'I' for 我

My wishes in 2013

There are a lot of things which are is very important for to me i did that I achieved in 2012. Although my work took a large part of my time, and meanwhile I had to managed to squeezeing in some time for to learning something. It's was a fairly busy year for me, but what I got from it was more than iI thought. So everything I did was worthwhile and meaningful. And i'd like to thank  give an appreciation to my boss who gave me a lot of responsibilities to me (which made me meant I had no time to look for a boy friend), from which I also gained so much many cherished experiences from it in the last three years. Thank you very much my strict boss, I would really appreciate it if you can cut down some the amount of my work in the nNew yYear even though I know that's impossible.
So my only wish in 2013 is that I won't be freaked out by my work.

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Good Job!

Some notes :-

The personal pronoun "I" must be capitalised "..I won't be freaked out.."

A full stop needs a space after it - "...three years. Thank you..."

Contractions need an apostrophe - wont -> won't