I'm sorry Monday, but look at it this way: it's not your fault.
It's just that Saturdays and Sundays tend to be soooooo much fun that the day(s) after can't be but boring. And you know what? I hate Tuesdays even more than Mondays because on yourday I can still reminiscence to the funny weekend I had. On Tuesdays on the contrary I'm already looking forward to the weekend to come, knowing that I will have to survive four more days of working before weekend (which means fun) is there.
So don't be sad: there is a day that's hated even more!