Struggling with my family

My parents especially my mom have been putting so much pressure on me, i have a really big family and all responsibilities are dumped on me. I've been religiously cleaning, cooking and looking after all my siblings (older and younger) for FIVE YEARS straight and i don't even get a thank you or anything in return.Considering the fact i have multiple heath problems its not even taken to account by my family. I'm currently sleeping on a old mattress and all i have is my school laptop (i don't even have a bedroom anymore) to communicate with family and friends. My parents are African i'm sorry if this is hard to read, English isn't my first language.