Afraid to show my boyfriend to my sister?

heyy(: well my names Jacky and I'm 14. so this is my first boyfriend eve and he's cute, funny, and I just like to be around with him. we met on exactly the last day of school, which sucks. So when summer's over and we go back to school, my sister is going to be a freshman at my hghschool. she's really judgmental. I know this is funny, but I like guys with swag. my boyfriend has swag according to me. but I'm afraid my sister will be so judgmental and say that he might be a loser or what-not. He isn't a loser, he's like a bad *** kinda, but he's also respectful to me too. and he's hilarious. I'm afraid that my sister would think that he's not even "cool" or whatever. I'm just scared what shell think about my new boyfriend /: What should I do? thankss(: