It wasn't much later when I had my own child, they finally broke me. Not only they set high expectations for how I will help them have relationship with their grandchild, and criticizing our parenting, but also started criticizing 2 year old. For their part as grandparents, they did bare minimum, that is attend a birthday, ask for pictures because relatives are asking for photos. Never made an effort to come visit us. That is when they broke something in my brain.
Now I resent them more than ever, I wish I had never let them criticize me as an adult. I lost faith in God since they are so religious. I am trying to be complete opposite of them. I have mostly stopped feeling joy. I live mostly to fulfill my duty as a father. I really want to pack everything and move to the other side of the world but wife doesn't agree with that.
And as a father, I realize that there is no sacrifice in parenting. You choose to be a father. That was your choice. My kids are the only things that bring me joy right now. Yes sometimes they push my limits and I am tired, but it was my choice to have them. Thinking that my kids are making me sacrifice will probably make me resentful towards them. When I am playing video games while tired because I am so close to finishing a level, I don't say I made a sacrifice.
EDIT: I want to add that I have lost joy in everything related to my parents like my culture, songs that I grew up with, religious festivals, food, stories, career, etc. I hate it.
On the one hand I agree children and young adults can be overly entitled or have too high expectations for their human parents on the other I think that framing raising children as a sacrifice is wrong. It is kind of the core point of biological life. In past times children were seen as a blessing now some times in the west they are seen as a burden. This inversion is part of the larger narcissism epidemic distorting modern society IMHO.
Now I know parenting is hard if you do it as religious duty to your god, family, country etc. But if you choose to become parent, like when you choose to pick up a new project or hobby, it is pure joy, even the hard parts. Yes you will be tired running marathon, but you will not say that you made a sacrifice. And unless you are trying to monetize you hobbies, you don't expect anything back.
Childhood as it is seen today is a very recent creation.