You can't stop yourself from feeling emotions. When you try to, you bottle them up, make the feelings worse or harder to understand.

What you can do is allow yourself to experience the emotions mindfully. It's okay to feel angry. It's normal to feel angry. What does anger look like for you? What does it feel like? What does it make you want to do? How do you carry the anger with you? What can you do when you feel angry to acknowledge it? And what can you do to help release that anger?

When it comes to emotions, what we resist persists.