>>1 Being a person who has experienced a similar hardship, I understand how you feel. They should understand that this school that they are telling you to go to is even worse than the one you are going to now, and that you are different than your sister. I suggest enrolling in classes that better suit your learning pace; I myself are taking two CP classes next year, and these two subjects are the worst subjects that I do. If I were you, I would ask my friends for help. To keep such troubles bottled up inside isn't healthy, and you never know, there is always one friend that is willing to help another friend out, no matter what the hardship. If the friends that you have right now are as caring as you say they are, I'm sure they would be able to assist you. I, currently, am handling many things as well; I like two girls, one of them I've liked since 7th grade, the other I recently met. I'm struggling to meet my parent's expectations of what they want from me, yet they constantly tell me that it's alright and that I shouldn't push myself. Atop of this, I assist everyone I come across; whether it be academics, relationships, games, experience, anything. I've been dealing with this for the past few years too.
I would like to apologize if this hasn't helped you too much... But I hope it gives you comfort in the fact that someone else with similar hardships is out here in this world. You aren't alone! This site and it's entirety is here to help you. Don't worry! Good luck, and stay posted!