I'm pissed at my parents
Why would you be pissed at them?
They betrayed me while I was away.
It's reasonable for a child to be mad at their parents sometimes. There are no perfect relationships.
But I am a very good child, I didn't even cheat on them.
I feel it is normal to be angry with them from time to time when we don't understand the reasons behind things. Could you explain why you feel they betrayed you?