Why does my father like my elder sister more than me?

My sister is 30 years old. I am 20 years old. He always treated her good. Even when she was wrong I was the one to get beaten up. When she was in her 20s he let her do anything she wanted, gave her 1000s in pocket money. She got spoilt. But told nothing to her. She returned home after days of partying but still told her nothing and I cant go out of the house with my friends for more than one hour a day. What ever decision has to be made in the house dad always asks her not me. All my life dad told me to become like her. Then when she got spoilt, he says dont become like her but still hates me and likes her. I dont know what to do. via /r/Parenting https://ift.tt/33HoALl