Maybe I should not have had a kid?

I wouldn't say regret (because I love my child SOOOO much) but I often feel sad about the things I've lost and wasn't properly able to say goodbye to because I didn't know I would lose them. For one, my pre-baby body. You see all of these inspiring photos of moms who've gotten their bodies back so quickly, but mine just isn't the same anymore. Also my participation in competitive sports as a year out of training, constant injuries from handling baby (wrist, hip), not being able to attend night trainings, plus being out of shape, means I can't catch up with my teammates. I've also "lost" my very close relationship with my niece as I now spend my time with my daughter more, of course. No regrets, but there is definitely some sadness.