Why am I so burnt out?

I have one child, an almost one year old (almost 10 months adjusted) and only have to keep up with 1 bedroom home. My child’s actually such an easy and happy baby but I’m still so burnt out and I feel like I have no right to be. I feel like something is wrong with me for feeling this way. I do 95% of childcare & 99% of everything else related to the household besides work obviously. Someone tell me I’m not crazy please.