Your only concerns would be getting enough to eat and making sure you aren't eaten yourself. Okay, you might get lonely, but lets assume you get over this. How would you live your life?
There'd be no-one to impress; no-one to look up to; no-one to be jealous of, no-one to compare yourself with; no-one to answer to; no-one to restrict you... everything you do would be because it serves you or pleases you. And if you didn't do it, it wouldn't matter because there'd no-one to justify it to. You would be free to follow your whim. The animals and plants wouldn't judge you and you wouldn't even consider judging them. If something didn't please you, you'd dismiss it and look for something that did – there'd be no need for excuses or reasons to do or not to do something because there'd be no-one to hear them. There'd be no problems to solve – just challenges to meet and overcome... if you chose to make them important to you.
You'd be free.
Well – this is how you should live your life now. Because, in this universe that you call “YOU”, you are the only person. You ARE free!