If you think you can't scream or have a mental block to screaming, you NEED to start light. Here's how starting with an extremely light fry is incremental to screaming with POWER.
Vocal fry is NOT the same as a fry scream. Yet when you learn the fundamentals of the voice, you use vocal fry, fry screams, AND false cord screams MUCH easier. Here's how.
In the end, a belt, no matter how powerful it sounds, is a shape of the vocal track. Do this and belt powerfully WITHOUT pushing and straining your voice.