You know what, your tantrums are totally valid. I've been there, I used to get angry at the drop of a hat. In the months before I decided I had to leave and get my own place (the best decision I ever made) I started going nuts, I was getting really dizzy to the point I couldn't even stand, and one day while my mother was at work I grabbed a chair from the kitchen table and smashed it on the floor until it fell to pieces. I used to have flip outs where I'd rip out my hair and bang my head against the wall. I still bang my head sometimes when I get worked up. I also got myself into the habit of lying in bed all day and not leaving the house for days at a time because I lost my energy and enthusiasm.

You aren't a bad person for feeling or acting that way, how else can you get your anger out? It can get to the point that the only energy you have is the energy to get angry and have tantrums. It is very exhausting waiting for help.