Why can't I connect to any multiplayer Minecraft servers?

So, when I start minecraft the option to "play" doesn't even exist. All I have is "Play Offline". I've tried disconnecting from the internet, shutting down my computer and restarting minecraft. I don't know what to do!

When I run minecraft offline, it doesn't let me play on any multiplayer servers, which i would expect. But I tried anyway, and when I did it popped up with the message something about authentication service being down for maintenance. I can't let you know exactly what it says because now minecraft won't even let me log on.

If you can offer any help, thank you! It's really stressing me out!

"Offline" means no authentication. By default, multi player servers usually want some authentication (except a few cracked servers)
Check your launcher, re-download it via your account. If you have a cracked launcher, it may be buggy…

These servers should work!
http://mineshafter.info/servers/liked