"Maglakas-loob akong sumigaw."
Here's the breakdown:
* Maglakas-loob means "to dare" or "to be brave enough to".
* ako means "I"
* sumigaw means "to scream"
You can also use a more informal, more direct approach:
"Lalaban ako sa sigaw!"
* Lalaban means "to fight" or "to resist" in this context it implies "to dare to".
* sa sigaw means "with a scream"
The choice of phrase depends on the context and the tone you want to convey.