I think I'm a toxic person to be around.
Why do you think you're a toxic person?
I'm sometimes very depressed and negative.
If you feel depressed and negative maybe this is something you want to seek professional help with. It's actually great that you can acknowledge something bad about yourself but now I hope you can do something about it.
I'm going to be fine. I have all rights to be depressed and I'm entitled to act however I want.
You're right that there's nothing wrong with being depressed. However, you should seek therapy. Going to therapy would help you feel better, and make you feel less depressed and negative.