I'd have to advise you to listen to bebelina. Meditation isn't like some sort of super power, you just do whatever you need to do to relax, maybe reflect on the days events, or personal issues, maybe just not really think about anything at all, while remaining calm, give yourself some time to get it all together, and come back refreshed and feeling ready to face the world.
If you sit down and feel too anxious, or start to get bored, maybe you just shouldn't try meditating right then, go ware yourself out a bit, or whatever else you think would prepare you to just sit and think (or not think) for a while, get into it slowly if you need to, put on some soft music and read a bit, and then put down the book once the prospect of sitting and not really doing a whole lot physically doesn't seem like it'll be a problem.