Hello, can you explain what is self? is the Self what you mean is the bullet itself or is the Actor that spawning the bullet?
If the Self what you mean is the actor that spawn the bullet, then you can also add additional check to make sure the bullet also ignore that actor who spawn it. You can do this by set the spawner actor as the owner of the bullet, then you can check that the overlapped actor is not equal to the owner (you can get the owner by GetOwner node).
If its not the case, could you explain in more detail like what you want and how you implement it to gather more information?