We are not alone. There is life everywhere, you just need organic material and a decent environment to sustain life. Now don't imagine life on Jupiter where you'd get crushed in miliseconds by the pressure or cremated by its welcoming heat. Every lifeform adapts based on its environment. There is unicelular bacteria with actual Earth-like DNA on Mars, our neighbouring planet. BUT, and this is a big BUT we haven't yet found intelligent life in the universe. One may say that it is actually possible to be Intelligent life on Kepler 438b or Kepler 186f (for example), as they have similar conditions to Earth's. Who knows if we would ever find intelligent life during our lifetime. But the idea of being alone is absolutely absurd. The universe is huge and there's likely people just like us somewhere (well, maybe not with a head or limbs, but people!). Religious people are now gonna be: "but humans' faces were created to look like God's, and he created our universe". Don't you think that's kinda narcissistic to assume that God chose us instead of any other lifeform? There's no solid proof that divinity exists, just old myths that people actually believe. It's crazy. Sorry for my english, I'm not a native speaker.