im so lost

Hi, im 15. lately things in my life feel as if they just falling apart.my whole family is a mess. my dad is not himself any more my mom is struggleing to keep herself together while tried to help my dad figure things out. my brother is not helping sonce he is failing his classes and lies to everyones face. and me? i dont even know whats goong on with me. i am trying to hold strong for everyone.but i am not the strong person they need me to be. i am depressed. i need help. i talked to mom but her plates so full i honestly think she has just forgotten about me. i want help i wanna feel better. currently i am just so lost and i know the things i am doing to "feel better" are not good for me but honestly that is all i can do since. its all i see that helps. letting it out on myself. now i cant sleep. theres a knot in my chest and terrible thoughts swirling around my head. i just dont know what to do anymore.