Tired of Pretending I'm Not Tired

My kids are little angels but man, they drain me. Yesterday, we went to the park and I sat on a bench for like five minutes before my husband told me to go play with them or he'd get weird looks from other parents. I stayed put. When they finally dragged me away, all I wanted was to cuddle up with a good book at home. Today, we were supposed to have a friend over but honestly? I just pretended to be busy so I could hide out in the basement and watch old reruns of my favorite sitcoms. Maybe it's not great parenting, but sometimes I need these moments alone or I'll go insane. Am I the only one who feels this way?