Ontological Reality A Myth?

Our perception of the world is the onlys access by which we can experience this mysterious world we live in and better yet these perceptions is unique and different from individual to individual as a result of our background-past and present and in general who we are as a person. This in summation is von Glasersfeld point or atleast one of them and to clarify this stance or the above statement i'll use this example. Lets say we have a questionaire about the MBTA ( Massachusetts Bay Transport Authority) and one of the questions is how safe is the bus/subway? To someone not familiar with the woes associated with the public transport they might say it is easy, accessible and safe ( which for the most part it is) but to me and most people who have taken the bus and trains in boston or atleast have listened to the news over the last few years i'll be a little bit reluctant to answer that question by just a check. After witnessing people being shot on a bus right infront of me my perception of the MBTA's safety is different from that of a person who maybe just started riding the bus a week ago. So my point, well my understnding of von Glasersfeld's point here is that our perceptions will differ from person to person based on our experiences. That brings me to Methaphysical Realism: the epistemological theory that believes in an ontological rality or "true" world independent of our experience. I tend to believe that there's a world independent of our reality but with my limited knowledge on the subject restricts me from proving how i can talk of this world independent of my experience. So that begs me to question, how would a methaphysical realist approach this? What would their response be to the presence of this real world outside my perception when my perception is the only way in which i can access that world? How can i rely on my perception or the perceptions of othere or better yet my perception of other perception ( mine and that of others) when our perecptions differ based on our experiences and there's no way of knowing which is true? This is a lot more complicated that matching a painting the paint on the wall like von Glasersfeld so eloquently attributed methaphysical realism to!!!!