Why does my older sister awlays lecture me on how I need to be more serious and organized?

I'm 21 and she's in her 30's married with a daughter. She's a goody goody and I'm. A little more more of a rebel. She tells me I need to cut my hair and shave cause I look like a pot head then she visited me on campus and and told me my rooms a mess and I need to act more professional. She also mentioned that I I need to stop drinking and start dating then pulled up a pic of a girl who goes to the same uni and wants me to ask her out. I'm not a screw up I have a good GPA and am on track to go to grad school and graduate. I just like to have fun and stay loose.
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Why does my older sister awlays lecture me on how I need to be more serious and organized?
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