A Gentlewoman [This is archaic, the modern word is "lady"]

Today, I buy a lady's clothes for myself 1 , and then get a lady's hair 2. I dressed myself like a professional women , appeared to be very independent and mature.The last year before I leave school and go into the society, I would like to seize the tail of my youth.3 Make myself looks cute and young.Change a hairstyle, change my mood, looking forward to a better day, a better future!

1.  這說法是平常你穿男裝!

2.  意思是你的頭髮是假的! 或者是男人的, 或者是獸毛!

3.  英文沒有這样的說法

Today I went to get some clothes for a professional look and a hairstyle for it.  I want to appear independent and mature. Last year, I graduated, I enjoyed the last days of my youth before I have to enter society.  No longer should I look too cutsy and inappropriate for my age. A new hairstyle and a new attitude towards life will bring a better day and a better future.

I am not really sure what you are trying to say in your last few sentences.  So I am guessing.