I feel really annoyed when both my parents are here.
What annoys you about your parents?
They do not leave me alone, they always want to tallk.
It's normal and expected that you want some time alone for yourself. Talk with your parents so a compromise can be reached and you can have a time and place to be yourself every so often.
I hate both of them, I want to get rid of them.
Do not get rid of your parents. Have a discussion with them about your need for alone time. I am sure they will understand that everyone needs some alone time.