14 year old dating?

I'm 14 and a boy at school I like has asked me out on a date. My mom says I'm not allowed to go. He planned for us to go to the aquarium and out to lunch on one Saturday. We would take the bus. It's about a 30 minute bus ride. I would really like to go and I'm upset that I am not allowed. My step sister is the same age as me and she's allowed to hang out with boys all the time. My mom said that's her dad's rule and she follows his rules where as I follow hers. I have no bad intentions with this date. I don't want to have sex or anything like that. I am a good kid. I get straight As every semester and I'm always respectful to my teachers and parents. I do my chores and I even do extra chores and I think I should be allowed to go. I feel as if I'm treated unfairly. Out of all my step siblings and brother, I am the most respectful and responsible. They all talk back and do poorly in school but they get to go out whenever. I tell my parents this and they said they hold me to higher expectations because of all of that. Are they being unreasonable? I think they are. Any guidance or suggestions?

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