I don't know what to do

So, I'm a middle school girl and my family is (probably) moving in the summer. My parents told us (me and my younger brother) that we wouldn't move if one of us said we didn't want to. They think both of us want to move. I actually really don't, I don't want to be alone again (I'm not good at making friends and I think I have social anxiety but I'm too afraid to tell anyone) and I don't want to leave my very best friends. I finally feel comfortable where I am, I know most people at my school and I have awesome freinds that I couldn't bear to leave, I've know them since 3rd-4th grade and I'm in 7th grade now. I told my parents, "The only reason I'm sad is because I'll be leaving my friends" which is only partly true and my dad told me its a good thing I don't have friends and I'd find real ones that weren't Hispanic. My entire school practically is Mexican, I'm not exaggerating in the slightest. I live in California. He doesn't know of course my struggle with finding friends and how attached I get to people, but still. I find that incredibly rude and hurtful, I don't care if my best friends are Hispanic. They're still people and they're still my best friends. Speaking Spanish has nothing to do with that. I would tell them that I didn't want to go, but my brother hates it here as well as my parents and everyone wants to leave but me. I'm having a huge struggle with this, I'm always crying or on the verge of tears and I'm lost. I am too afraid to tell anyone but my best friend how I feel, and she doesn't want me to leave (of course) either. She thinks I should tell them how I feel. But I have a problem with not being open to other people, including my parents. I've literally only opened up to 3 people ever. My old best friend, my new (current) best friend, and my cousin. I don't know how I can do it, I don't know how I could disappoint them by saying I don't want to leave, I'm too afraid to tell anyone. Not to mention I am extremely nervous and self cautious around people I don't know, it would be 10x worse in a new school where I literally knew no one. I'm about to cry right now with my family in the car writing this. I don't know how I could tell them, and if I didn't I don't know how I'd cope with being alone. What should I do? I'm honestly so lost, I always feel like I'm not worth as much as other people and I have no right to be happy, and I'm afraid, lost and upset. Help..