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If your machine has Bluetooth, you can also pair your phone to the computer and configure the machine to lock automatically when your phone goes out of range (which is when you get roughly 30 feet away). Make sure the computer is set to lock your session after some minutes of inactivity - 10 or so is generally fine - and when resuming from sleep, and lock it yourself when you get up to leave the room any there's a chance somebody else might take the chance to use it (the shortcut to lock your session is WinKey+L, or you can use Start or Ctrl+Alt+Del and select Lock). Don't do something silly like put it on a sticky note in your office or use a really obvious password hint (or any hint at all). Make sure it has a strong password, and change that password if you expect somebody you don't trust may have seen it. The next (and often most important) line of defense is your user account on the computer.

Physical security is mostly out of scope for Security.SE, so I'll just mention that, if the computer is somewhat portable and you're worried it (or its hard disk) might get stolen, look into using full-volume encryption (such as Windows' BitLocker feature) so the thief wouldn't be able to retrieve any data. If you're worried about somebody else gaining access to those accounts, the first line of defense is preventing physical access to your computer by people you don't trust. Another user on the same computer would not have access to your sessions (unless they are themselves an Administrator, and possibly not even then depending on how the sessions are stored and whether you are ever both logged in at once) if they launched Skype it would either ask them for a password (if they hadn't used it on that computer account before), or resume their own session. Unless an attacker is able to either sit down in front of a logged-in session on your computer, or get you to run malicious software either within your user account or as an Administrator, those sessions are safe. Skype, like a huge number of other apps, sites, and services, uses long-lived login sessions that are stored in your user account. The advice here applies to all operating systems, but the specific details vary somewhat. You didn't specify, so I'm going to assume you're running Windows.