You don't say how old you are, which is important. Childhood emotional situations are not the same as adult ones and what one needs to do in situations therefore differs as well. If you were an adult, I'd say it's time to give your cat to someone else for now and see a therapist to figure out what's going on and form a plan to deal with it. If you're a child, you need to speak to a school counselor and your parents. You also don't say exactly what's going on with your family. Life throws difficult things at everyone, but not everyone reacts to them with anxiety or out of control emotions. But almost every child does so on occasion -- they're children. So maybe something is going on with your family and maybe you're just bothered by things that happen to everyone. Without more detail we can't know. If you're living at home and really think your anger is rising to a degree that you're a threat to the animal or to someone else you really need to talk to someone you trust ASAP and get some help. If it was a temper tantrum, kids get those, they're kids, and your parents have the job of controlling them and teaching you that you can control them. If that isn't happening, you may need to see a professional therapist for that help. If you tell us more about your age and what's going on and your living situation, we can be of more help. I once acted out on my dog when I was a little kid, but I never did it again to anyone or any animal and I'm old now so it didn't become a part of who I became. Kids do some pretty cruel stuff and then they grow up and either do even more cruel stuff or they stop doing cruel stuff, but in general, people aren't the kindest creatures on the planet. I hope you decide it's better to be nice if this isn't an illness, and if it's an illness, I hope you recognize it as such and seek help.
Welcome to MedHelp's forums. We are sorry you are feeling this level of anger and do encourage you to get help with it. At this time, it would be best to allow someone else to care for your kitten for its safety.
Anger is a normal emotion but can be destructive when expressed in inappropriate ways. Here is some information from Mayo Clinic with regards to controlling anger. https://www.mayoclinic.org/healthy-lifestyle/adult-health/in-depth/anger-management/art-20045434.
It would be best to be fully honest with a doctor and or therapist for your safety and that of others. Please let us know how we can help.