why am i lashing out and going mad?

Im 24 years old live with my brother 20, sister 17, and mom & dad. I have anxiety/depression and i was on zoloft for 1 year 6 months. Why am on it? Well I had social anxiety and I wasnt going out to school and stuff. So when I got on it I got a job and im back in college. This semester i did pretty good 3.0 avg and I quit my job last month. Im a active person I havent been to the gym in a week and just at home playing video games watching movies in my room and we dont start college again until 1-7 so basically I aint doin ****.

So I pounded on my bro today for no reason just beat his ***. Then today I cussed both my parents out and said i hope they die I said some mean heartless **** like I hope you guys die of cancer I hate you this n that and went nuts i didnt get violent and went to my room.

Keep in mind im the nicest person to other people and with friends and im very shy and quiet. At home its not always like this and Im never violent towards my brother I havent hit him since we were teens. And I would get the cops called on me for domestic violence I even hit my mom and dad when I Was a teenager and went to juvenile and I havent touched them since. But now its verbal abuse and today i went nuts on them and said they ****** my life up and said the meanest **** to them and cuzzed them out good. It was sick now thinking about what i said and I didnt mean it but why i say it? I have a lot i been holding in but Im not going to hit my bro again that was ****** up i didnt hit him in the face and it wasnt anything crazy I just hit him in hsi arms and was holding him and pounding and got off. But It feels like theres a lot of revenge sadness anger confusion and a feeling of hopelessness in me feels like I wanna die but not really because I do enjoy living but I feel stuck in the way that is not life. I hate my life.