Why do people don't believe that i will change to a better person?

I don't understand why I want to change but chance people won't give me. Last time I already promise my besties jie jie that I will chance but to last time that huimin and will not do things is not right to hurt my love ones.  I don't know why still no one want to trust me that i will change. I really don't like what i did now, I like what i did last time and last time that huimin have many people love me and dote me.  What i need was a chance to change and i also need time.. I don't understand people don't trust me and don't want give a chance to change and time really will prove everything and nothing is impossible in this world. In this world that is no one is prefect in this world. 这个世界没有人是 十全十美。

、