Yes, most of science is still "theory" and yet it's presented as fact. No, mass doesn't attract anything. Whether it's electromagnetism or nuclear forces or ether pressure, mass itself cannot act at a distance on mass, and that's acknowledged by many in mainstream science.
That's first statement a false statement. Most of science consists of well tested and verifiable hypotheses with falsifiable predictions. The foundations are very strong. Only theoretical science and bleeding edge research can be called "still theory".
Your second sentence is also not true, do you know about quantum entanglement? Two spatially distant particles are still coupled to each other and will react to each other. We can't yet explain how that works. So saying "mass itself cannot act at a distance on mass" is just a claim.
Do you see a problem with just claiming things?
Your last sentence is also just a claim, could you post a reference to back up your claim?
It's not necessarily "attraction" either; it could be something (e.g. ether pressure) pushing things toward one another.
Ether pressure is completely unsubstantiated - neither is ether demonstrated to exist, nor is there any form of pressure that would work similar to gravity.
Another claim. Would you rather accept all of these "could be's" of yours which are mostly unsubstantiated, untested, not formalized nor peer reviewed by anyone, or the other possibility of well tested hypotheses, whose effects can be empirically observed?