My sister is a pick me, how do I deal with it?

I have no one to talk about this to because it isn’t acceptable to talk about your sibling that way. My sister is 7 years older than me and she loves attention from guys, this doesn’t bother me when it doesn’t meddle with my own love life. Recently a guy 5 years younger than her started working in the same office she works at, she barely talked about him only said that he was a good guy but after a month or so she suggested that I should meet him like a coincidence so I agreed I visited her at the office and I met him we talked for around 20 mins by the convo and the way he was looking at me he seemed interested and he asked my sister about me after I left. So she told me but then immediately mentioned that they get along so well and he was so mad and upset when he found she’s much older than him and how they laugh and joke around all day implying he actually likes her. I had a guy that’s been trying to date me since 2015 so my mom was telling me that maybe I should give him a chance and as soon as I thought I would, she started mentioning that he’s disgusting and he used to like her when he was a teenager back in 2015 and that he just wants any girl. And she visits a store where a guy that’s our neighbor works I never went there and I needed to buy something so I went there with her and the guy was my age and we were joking around, she started making comments embarrassing me in front of everyone. I asked her which top I should get and she started saying make your decision yourself because when we get home you’ll start crying saying I made you choose the wrong top implying that I was childish ( mind you the last time I’ve done this I was in fourth grade and I didn’t know you can return or exchange clothes) then she turned to him and said careful she’s a Scorpio (my astrological sign) she’s hard to deal with and she may sting. P. S she doesn’t date guys younger than her nor is she interested in any of theses guys

My sister is a pick me, how do I deal with it?
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