Family issues

I don't even know how to start this, I Just have to let it Out I guess. My Family is a hot mess and I cant Put Up with it anymore. Moms a alcoholic and barely speaks to me, dads Acting Like His new girlfriend suddenly lives with us now even tho they only know eachother for Like max. 3 months, and my sister thinks she can judge every step I Take and my dads Always taking her Side. I started Smoking, drinking, Smoking Weed etc. To Put Up with it Put im Just breaking apart atp. Im having thoughts about hurting myself and more and when i ASK my dad for Help or therapy He Always says he will Look for therapy places but He never does. All He and my sister do IS judge everything I do and how I do it even though i only need a little Help to get it done... I Just don't know what to do and I cant keep living in this Trash of a household. The only place I barely feel Safe is my bed and only when Im sleeping.. I can hear my sister in the next room talking Bad stuff about me to my other sister over the Phone rn.. I Just don't wanna be Here anymore. Oh and ontop of all that, I have Diabetes and constantly get Made fun of or my dad and doctors get Mad because my blood sugar Levels are too high.. even though I have so much in my head right now I Just cant do it all at once