도와주세요~~~

Could you help me to sound more... natural? I need to use 반말 but it's a little complicated. Thank you.

오늘 오빠와 당구를 쳤어요. 제가 져서 벌칙을 받았어요. 저는 5월 22일까지 한국어로 음성 메시지를 보내야 해요. 처음에는 20일까지였는데 제가 그냥 조금 불편해서 오빠는 "그러면 22일까지 할거야, 넌 떠 음성 메시지를 보내고 싶어?"라고 말했어요.오빠는 나보다 나빠요. 왜냐하면 오빠가 질 때 항상 많이 불편해요. And I don't say to him to do more punishment days. He thought that 2 weeks was a lot and he says to me more than 3 weeks. That's so unfair!

I wanna say:
Today I played with 오빠 to billiards. I lost so I received a punishment. I have to send him voice messages in korean until May 22nd. At first it was until 20th but I just complained a little and he said "Then you will do until 22nd, do you want to send more voice messages?". He is worse than me. Because when he loses, he always complains a lot. And I don't say to him to do more punishment days. He thought that 2 weeks was a lot and he says to me more than 3 weeks. That's so unfair!

 

I think it is like a diary. so I think it is better to use '반말'.

 

Today I played with 오빠 to billiards. I lost so I received a punishment. I have to send him voice messages in korean until May 22nd.

오늘은 오빠와 당구를 쳤다. 내가 져서 벌칙을 받았는데, 5월 22일까지 (매일) 한국어로 음성메시지를 오빠한테 보내야 한다. 

At first it was until 20th but I just complained a little and he said "Then you will do until 22nd, do you want to send more voice messages?".

원래 20일까지였다가 내가 조금 불평하니까 오빠가 '그럼 22일까지로 하자. 음성메시지를 더 많이 보내고 싶어?'

He is worse than me. Because when he loses, he always complains a lot. And I don't say to him to do more punishment days.

오빠는 나보다 더 못됐다. 오빠가 졌을 때는 엄청 불평했다.  그렇지만 나는 더 많은 벌칙기간(punishment days)을 요구하지는 않았다.

 He thought that 2 weeks was a lot and he says to me more than 3 weeks. That's so unfair!

오빠는 2주는 너무 길다고 생각했지만 나에게는 3주 이상을 말한다. 이건 불공정한거야!