Well that's a thing about negativity. Although, from my own experiences, a true friend will stick with you even if you ramble on and on with your negativity in tow. I've had the pleasure of being such a friend and having a friend do so for me; since I too have negative thoughts flowing through my mind.
Give it a try! Speak freely, disregard your consciousness of your negative thoughts and just let it out. Although, of course, not everyone are so.. accepting of such expressions so take care when you're doing so with people you know and are familiar with.
Anyway, I hope you find someone to chill with - irl or online - be it a stranger like me or a friend you've known for years. :D