After high school, I developed self-hatred and mild depression.
What happened to cause that?
I felt like no one needed me and when I was alone in the darkness of my room, I started hearing voices.
I'm sorry that happened to you. You should seek professional help if you're hearing voices or struggling with depression. If not, it will only get the best of you.
I develop skills that help me perfect being depressed and they were pretty fun.
You shouldn't treat being depressed as a game or fun. Depression can have a really bad and lasting negative impact on your life and the life of others. You should really work on trying to improve your mental health.