Human No More?

Ok, no philosophy this time. I have a real physics question that's been bugging me for a while, and I can't seem to find any answers to help give me a clear understanding of the situation. I think I have a basic idea, but don't know if I'm at least on the right track or not. I've heard different hypothesis regarding gravity, and just what it is exactly. At this point I get the classical physics idea of it being associated with the curvature of space due to mass. I also realize that it can affect and bend light around objects like stars. The thing I'm having problems with is if it should be as strong as say the electromagnetic force, then why isn't it? I heard recently that what we experience as gravity on our level is actually a "bleed through" effect from a deeper level or dimension of reality? This would explain why it appears to be weaker than electromagnetism when it shouldn't be. If this is true then does it still operate on the premise that it's the result of the curvature of space around mass? Does this mean that this hidden or inner dimension is somehow more dense or massive than our own physical universe? And what part does dark matter and energy play in it all, if any? I would appreciate any insights from professionals and laymen alike.