Is it normal be be this depressed

im depressed out of my mind since ive put up with bullying for most my life. im now in college and i cant take holding in my emotions any longer i hate my alcholic dad who never sees me even though i know where he lives and he knows where i live, my younger sister steals and lies to me and my mum as well as being verbally abusive and im all alone.i cant talk to anyone about my feelings because i feel like my problems are tooo small and may cause others problems. i had a mental break down and threatened to stab my freind after he ditched me. i didnt have a weapon i just wanted him to leave me alone. is it normal for me to feel this way.