When I worked an office job I used to hate Mondays, just like everyone else. It's normal to not enjoy going back to your workplace after the weekend, especially if you're working for someone else and you don't care much for your work.

Nowadays I work nights, so Mondays are no longer a problem for me, cause all nights are roughly the same. Well not exactly, Friday and Saturday nights can get weird since people go to clubs, get drunk and I sometimes have "guests" at the parking lot