Ok, I think I understand you now. So you want to prevent your projectile from colliding with your own Player. Thats pretty simple there is a function called ‘IgnoreActorWhenMoving’ defined in the Component class. SO when you fire your projectile, get a reference to its collision component and add your Player into the list of Ignored Actors. You could do the opposite for your Player as well (ie add the projectile into the list of ignored actors for your player’s collsion component).
So right after spawning the projectile, do this:
projectile->sphereCollision->IgnoreActorWhenMoving(&this);
Also do the opposite in your Players code:
this->capsuleComponent->IgnoreActorWhenMoving(projectile)
NOTE: I did not test this code, so there might be syntax errors. So double check the code.