In another sense I do pragmatism. My beliefs seem to work and that is all I have.
So I assume you are never wrong about anything ever then, correct? Otherwise your statement that your beliefs seems to work wouldn't make sense, from a logical point of view.
If you at any point in your life realise that you were holding a wrong belief, then it basically mean that you would be unable to trust your own mind. Because how many other wrong beliefs are you currently holding which you are not aware of. And since you can't trust anyone else, you have no method of testing, whether or not your own beliefs are right or wrong. Do you see the dilemma with that?
I came to where I am now as a general skeptic, because I kept wondering how we can all in part have different beliefs of what objective reality really is in itself. We can all do that because they are all beliefs.
Yes, we hold a lot of different beliefs, but we are also fed different information, throughout our life. One might be raised in a home of JWs, and get vastly different information than one raised in an atheist home. You might grow up in a different culture, listen to different news channels, seek different informations.
But the vast majority of people share a lot of beliefs as well. Most people regardless of being religious or non religious, believe that the feeling of love exists. That being tortured or threaten on your life is not good. But these are also kind of simple beliefs, that are easily understood and accepted upon.
Whereas, how do you create the perfect society that secure that all people are happy and no one have a reason to exploit each other, is not. We have different ideas of how such thing is achieved because its complicated, and we might not all have the same experiences or information to draw upon.
And don't get me wrong, that ultimately I can't demonstrate to you, that everything doesn't just exists in your head. But as a way of living and thinking about life, I would find it both extremely frustrating, but also immensely unsatisfying that one can't never really know whether they are sane or insane. Not implying that you are insane, as I don't think you are. But from a logical point of view as pointed out in the first section, one would have no way to tell the difference, if at any point in their life, one have ever held a wrong belief.