I had to give up a number of hobbies and intelectual pursuits in order to be there for my kids. Building a caring, trust-based long term relationship is hard work - sharing the same blood and providing a roof and a meal is not enough, which sadly is many people’s definition of parenting.
I know I am giving up things. I know there is no sure-fire bet that I will get “returns”, but I love my kids and knowing you can love someone so much is a gift by itself, IMHO.