Suicdes a real problem?

i am seriosly considering suicide i mean let me give u a lil backgroud well my mom might have cancer my grandpa just died from cancer aand my paents divorced when i was 6 aand it went on 4 5 years police cars were in the drive wa evey night i went 2 a mental instution 4 a week b/c of suivide thoughts and it didnt really help my mom is phsyco and i mean she has serios mental issues and i am already on 20 mg of prozac so yeah and my best friend in the entire world is gonna kill herself also but she doesnt no abut me and she just told me this yesterday and i dont no wat 2 do ok so theres a lil background but if u have n e more questios then ask and ill add details and plzz help!!