Any advice on bad friends??

Please bare with me!!

Okay so I’m in high school right? And there’s this girl whom we’ll call Shelby. So Shelby and I have gone to the same school since 6th grade but we only started talking about 2 years ago. And I don’t think Shelby’s a bad person or anything but she acts like a totally bitch to me.

Let me explain in several instances where Shelby has made me feel like absolute shit.

1) She never lets me borrow her stuff. It’s not like she has to share her pencils or paper with me or anyone but it’s ONLY me she doesn’t share with. I use to ask her why but all she would respond with “I don’t like you”

2)She’s called me ugly multiple times. There are a lot of times when she tells me I’m not pretty or I’ll never get a boyfriend because I’m to ugly, stuff like that. And I understand that all of these things things can be jokes but she has this tone that you can tell she means the things she says or at least she says them with the indent to hurt me.

3)There was one particularly incident that really brought this to light for me. So this story has another person whom we’ll call Jenny. (Now a bit of back story Shelby LOVES Jenny. Like nothing Jenny does can be wrong on Shelby’s eyes. And that’s fine because Shelby considers Jenny her best friend. But she sometimes brings me down to bring Jenny up. She one time said that people like Jenny more than me) So me and Shelby were talking in math class (don’t worry we were done with our work) and I mentioned how Jenny and I were sometimes asked if we were sisters because we kind of look alike and she sits there and says with the most serious tone “that’s not possible Jenny’s WAY prettier than you” and that broke me. I had been struggling with self worth issues and self harm at the time (I’m better now. I’ve been talking about it with someone) She didn’t know this but I felt like crying so hard, so I turned away and stayed silent for the rest of the class because I knew if I talked I would start crying. (It still kind of hurts to talk about it)

4)And then there was another incident, or rather, incidents. So a little bit more of backstory, one of Shelby’s guy friends (we’ll call Brad)asked me out (I said no but that’s not the point here) So Shelby brought it up again and she said that her friend asked Jenny out before me. And that’s no ones fault, I don’t blame Shelby or Jenny. But any time this is mentioned Shelby always has to say something like “but he asked Jenny out first”, “he liked Jenny more than you”, “ you were his second choice”, “he think Jenny’s prettier than you”. Now I don’t like Brad but it hurts my feeling that she says things like that because it’s so unnecessary to tell random people that.

5) MORE BACKSTORY!! So it was Shelby’s birthday party and she was handing out invitations. Now some of the invitations had errors on they (the date was wrong) so they had big X’s on them. Now, if I had gotten one with any X on it I wouldn’t have complained but what she did was really uncalled for. She hands me the invitation and before i can open it she grabs it back and looks at the card to MAKE SURE it has and X on it before handing it back and declaring “okay you can have THIS ONE”!! GET IT BECAUSE IT WAS A MESSED UP CARD. As if I’m not worthy of having a card that doesn’t an error. It was in front of a group of people too, to make matters worse. Maybe it was the wrong move but I gave her back the card and said I couldn’t go even though I totally could, but I wasn’t going to, especially after that.

There are of course more times where Shelby’s has been rude. And like I said she’s not a bad person but I hate the way she makes me feel insecure and inferior even though I know I shouldn’t let her have that much power over me. I would totally tell her to back off but most of her friends are my friends and I feel like they would take her side instead of my and i don’t want to appear weak either. Classes are starting again and I don’t know what to do because I have her in all my classes except two. Any advice on literally anything I could do. I know to some it doesn’t feel like a big deal but I don’t want another year of her hurtful remarks and having to convince myself while I lay in bed that they’re not true.