Why am I slightly freaked out by solipsism? Is it my OCD again?

You're slightly freaked out by solipsism because you should be. Think about it: every person you've ever met, every person you've ever loved, every person that has ever loved you, every action, every thought, every physical sensation---it's all an illusion. Your life is one big conspiracy theory, and the worst part is: you're the one who created this whole insane spectacle. The only escape is death, and even then, nothing is certain.