This is where you are wrong. Of course what we experience through our senses is a representation, but it is a representation of something that exists outside of ourselves.
There is your assumption right there: that there a world outside of us that we represent.
Bishop Berkely was the first person in the Western philosophical tradition to point out how this an obvious assumption when critiquing Cartesian dualism. We don’t actually know the world is outside of us. All we know is that whenever any perception happens it is preceded by mental processes. That is all we know. Hence Berkley concluded that idealism is the the most rational viewpoint to explain reality.
It is entirely possible to have a reality which is made purely out of the mind and have a me and other, or inner and outer, this and that within it. If you take a box, and within the box you place a divide, then you divide the box into two areas. Can you then say that the two areas are two different worlds made out of completely different substances? No. Similarly, the fact that we perceive an inner world and an outer world does not mean that the inner and outer are two different worlds made out of two different substances.
Dualism is not a respectable philosophy in modern philosophy and has been defeated for centuries. I was told this directly by my professor when I made a pro-dualist case in one of my essays. Nobody accepts dualism because it is clear that mind and matter are part of the same substance and this has been pointed out by several philosophers. Most scientists argue that this common substance is material and argue away mind as an epiphenomena of material activity.
Then there are idealists who argue in fact it is the other way around, the substance is mind and it in fact matter which is an epiphenomena of mental activity.
There are only two possible explanations here. It is either material or it is mental. It cannot be both. One is right and the other is wrong. Dualism is not tenable.
Of these two possible explanations the only that makes any sense at all is idealism. Even philosophers consider this option to be the only one that actually has the least philosophical problems. First of all, it is an obvious that whatever we perceive is a mental construction. Secondly, it is a fact materiaism leads to the hard problem of consciousness which cannot be resolved. This leaves idealism as the only sound and rational explanation for reality.
Your reasons for clinging onto dualism are religious. No scientist takes dualism seriously. It is only religious people who cling onto dualism. Just like they also cling onto things like flat earth. You may not cling onto flat earth, but you certanly cling onto the philosophical equivalent of flat earth.

