If you really want to traumatize yourself, learn about Scientific Realism vs Instrumentalism. (And further reading, Early Wittgenstein, but know you are only going to understand 10% of it, but that's okay, everyone only understands 10% of it)

If you want to further freak yourself out about probability look up Bertrand's Paradox and The Problem of Priors.

Yes Social Science is less accurate than what people call hard science, but the edges of scientific systems should concern yourself of validity of even hard science. Its pragmatically useful, yes, but metaphysical Truth? No.