HOW TO GET RID OF HORRRRRIIIIIBBBLLEEE FLASHBACKS!!!??(they are killing me)?

during 6th and 7th grade,my life was hard,i have been physically and emotionally abused BADLY,and now i'm going to 9th grade,and i'm still remembering these thoughts,they make me cry hysterically and i keep having suicidal thoughts,i wanted to start by cutting myself,but now i realized i should fix the problem and not erase it,now that i am more mature these thoughts will be stuck with me for the rest of my life,i dont want to die knowing that i've lived through hell.the people who ruined my life,are not in my life anymore,but my mind is always traveling with me wherever i go,even to hell.like for a real life excample,i went on a trip to washington and all i could think about on the bus was my past.now i hate my life,and i changed really bad,help plz? my mom tells me:ur just a teenager,in 30 years from now u wouldnt even remember their face. but after 2 yrs i'm still thinking sick? my mom signed meup to therapy,but i used to go to therapy she made me feel better but only for a day? these 2 people who ruined me,dont give a **** about me,but i do and thats why i've been acting crazy and i seek help