In a certain way that is true. I only have epistemic access to my private thoughts and sensations. I can't know what you are seeing or feeling or thinking. Wittgenstein called it the beetle in a box. Everybody is given a box and everybody says theirs has a beetle in it, but you can only look in your own box. You have no way of knowing if a beetle to you is the same as a beetle to the person next to you. I think here though, the idea of reality is a little bit different. I think here, reality means a "world as it is." In other words, a world that we all inhabit and that we experience, for the most part, roughly the same. The OP was suggesting that perhaps, such a world does not exist, even though intuitively, it does seem to.
our perceptions are indeed internal. when we stub our toe, even what we think we have stubed it on, is internal. but the fact that we stubed it on something, would certainly seem to strongly suggest to me, that some things do still continue to exist, when we stop believing in them, and thus, can only be called real.
You run into a bit of a problem though when we consider dreams. You might have a very vivid dream that you stub your toe on a table. It seems so real that you can feel the pain, see the table, and ever hear the thud of it hitting the table. As soon as you wake up though, you stop believing you stubbed your toe. The table, the pain, and the sounds are all gone. You don't believe they exist anymore. Was that dream then reality? How do we know that we are not currently in a dream. Maybe you are very vividly dreaming what you are currently experiencing. The issue of skepticism remains until such issues are answered adequately.