If you were to go into space today, your chances of surviving are pretty slim. You'd need to wear special clothing, including a spacesuit. Your suit would also need to protect you against the vacuum of space, which would suck all the air out of your lungs. Without any oxygen, you'd die within minutes.
Your skin would start to burn because it wouldn't be able to breathe. The blood vessels in your eyes would burst due to lack of pressure. And your brain would swell up like an over-filled balloon. It would not be a pleasant experience.