I feel extremely angry, and I don't know how to get rid of it. What should I do?
Can you tell me why you're so angry?
Probably because I have to confess about cheating.
If you're cheating, there's consequences. There's no point in being angry about facing those consequences.
I guess.  I should take responsibility of my actions and suffer the consequences alone. I'm the one suffering here.
Having consequences for your actions isn't suffering. You should consider the people that may have been harmed by your cheating, they are probably suffering more than you. It might help if you fully take responsibility for your actions and apologize.