Solipsism

Could it be true that I am the only thing that exists, that all outside my mine are illusions or illusory, that it is impossible to know anything or anyone beyond one's immediate experiences?

We are hopelessly subjective, and it might be so that objective reality cannot be known as it is, or that it even exists, and that all we can know or be conscious of is our own experience. I do not know or not know for sure that solipsism is false, but my epistemological moderation, half way between being an epistemological optimist (There is knowledge to be ascertained and claimed by humans; there is objetive reality out there, and we can know it.) or radical dogmatism, and the bleakest, epistemological  pessimism that all we can know is what are conscious of or experience within our own minds, an isolation that cannot be ended or surmounted. We are radical skeptics about any claims to external reality or descriptions of its properties, inhabitants and objects.