What should I do?I fell like I'm dying inside?

Please first i want to say that if i am just overreacting tell me please!I'm 12,I always get excellent grades and exams are coming up,and i fell so stressed,my mother hit me yesterday with some boots because I said i hated my life,my sister closes the door of her room always ,by the way she kicked me out and mom helped her,they moved my clothes to mom's closet,so now I'm sleeping in the living room,my father and brother are both unemployed so we are extremely poor,we don't even have a house of our own,the one we live in has benn gicen to my father who was director to a public school,but they still haven't asked us to move out,it has been 12 months sice my father stopped getting money,we get some money from my married brother,but it's no use,I don't have a cellphone,so I lie about it at school,my mother and my father say i should be patient,but i feel so dead,I cry everyday,especialy that summer is coming up,in summer we never go out litterally,my mom or dad buy the groceries ,so we don't go to the beach or anywhere,they don't let me go to friends house,in summer I'm always depressed and i think it's starting now because my best friend told me to choose between her and another girl,I chose them both but she chose another girl over me,she says good luck with that other girl but I really care about them because they're both my best friends!!I think i am depressed!!+I have this stupid stomach ache that won't stop !!