You must be using a different definition for the word "real". Subjective experience has been proven to be unreliable at times.
Of course it is, when we compare different experiences. But think about this, do you know if the world around you exist or not? Do you know if other people exist or have a mind? The only thing you, personally you, know is through your own experiences. Everything you know. Everything you can think of, all comes from your own experiences. Right now, while typing, or while you are reading this, we are going through experiences of the world. The world, however real it is, and however it actually is formed or exist, comes to us through our experiences of it. So whatever "real" that we ascribe to the world is all based on our own personal, and unfortunately very subjective and unreliable experiences. In the end, the only thing you know for absolute certainty to exist and be real to you, is your own personal experiences however wrong they might be in contrast to the rest of us.
The way we see the world around us is nowhere near perfect, and we are often fooled by our brains ability to adjust what our eyes see.
Absolutely. Also, today in physics, the underlying explanations to quantum mechanics are unresolved. It's a world we can't see or experience. We can't even figure it out. There are many different ideas, but they're all very speculative. Take the hologram principle for instance. It suggests that matter doesn't exist, but all that we see and experience is all an illusion of something else. Which means, that even what you think is the "real" real, isn't. But still, in the end, it's the fact that having an experience, not necessarily some kind of "true" experience, but the fact of just having experience is what is real to us. To feel. To think. To act. To be in the now. All of that is real to you right now, even if you close your eyes and stop listening to the world around.
For example, think about the "following eyes" optical illusion, where a concave face appears as if it is watching you when moving past it. In actuality, it is just confusion in the way our eyes our communicating with our brain, and our brain tries to correct it. We cannot trust subjective experience as evidence without verification.
Sure. The truth value or the actuality of what is experienced might be way off. I'm not saying that just because you experience something that this experience is a reflection of what the true world is out there. What I'm saying is that the only thing you can be certain about yourself and your own existence and existence in general is that you do have feelings and experiences. Without having experiences (even if they're illusional/delusional) you wouldn't be you with a mind thinking of the things that are around you. The things around you wouldn't exist to you unless you had some experience (however accurate) of their existence. The reality of the world comes to you through your experiences, regardless if you want them or not and regardless if they exist or not. Your experience, as such, is the only thing you know exists, even if you can't be certain those experiences are accurate in relation to the things being experienced. There's a level of subject vs object that I'm dealing with here. I'm not referring to "the subjects function in relationship with object" but the "function of the subject" alone.