What should I do

Dear Mary, 　
　Yesterday,I went to the shop and saw a shirt.I think it is very beautiful and fashionable.I was watching it for a long time.So I wanted to buy it for myself.After that,I went home to tell my mother,but she didn't agree with me,because she thought it was very expensive!I didn't believe!"I just buy it,I need it!"I shouted at her.But she didn't care me.I knew she was mad at me.She said I couldn't understand her.Why? 　 小荷作文网 www.zww.cn
　I really want to get the new shirt.What should I do?Can you help me? 　
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 Yours, 　
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 Sun Li