Someone please help me here.

You could try and see if your dad could persuade your mum to let you do it.

Tell her the benefits of it such as it reduces anxiety and depression as well as gaining confidence through it.

Any more suggestions?

You should go for it. But just know about what could go wrong and help your mom understand how it may help you and how much you want it. I did boxing for 4 years. 16-20 and I loved it and of course my mom was concerned too but there was never a problem about me being unfocused from education or being harmed. But then..my friend also did boxing, the same time as me but much more advanced, and he had his 6th amateur boxing fight and even though he was wearing head gear, a punch to his head paralysed him for 18 months. So stuff like that you need to consider before anything else. It's what made me stop.

I want to go for it but I need both of my parents permission said my trainer.

How old are you?

Just wait a year, that way your education will be dealt with too, For now just train hard yourself or with friends so that you have a good start when you actually begin boxing. It'll fly by.

I tried this and the reason why she thinks it will make me aggressive is because my uncle did boxing and he was an aggressive person and started to have street fights, she is worried that it will make me like him.