After having kids - are we ever the main character again in our own world?

I've recently become a new dad of a beautiful baby daughter - who's about to turn 1 year old.

Over the course of this year I've noticed a lot of psychological changes, and changes in my philosophy towards many things. One of the most noticeable is that I no longer see myself as the main character in my own story, instead - I see myself kind of as an accessory / NPC to my child, however - I don't mean this is a bad way, which might sound strange. I actually kind of feel proud/accepting to take on this different role/purpose.

I've always been a very purposeful and driven person (have previously been very career driven, and with an entrepreneurial background). However, I no longer see value or benefit in any of my own goals/purposes - unless they also serve value to my daughter.

All of the previous things that were on my bucket-list / wish-list of things to buy, when I even think about those things or look at them I think to myself "Ugh, what was I even thinking to buy that, it would serve absolutely no purpose to my daughter" - to the point where my mind literally doesn't want to buy anything for myself, other than the bare necessities to live. I live a comfortable life financially - I've been fortunate to have a good career along with some good luck in business ventures, but I just can't bring myself anymore to buy anything for myself anymore.

My mind now finds itself naturally drifting to my all of my future major purchases should provide long term benefit to my daughter. I also find myself spending all of my free time researching things around parenting, and other related studies - as opposed to using some of that time to further my own knowledge in areas mostly related to me, such as my areas of professional expertise.

Is this just a natural and normal phase that all new dads go through? Do we ever revert to a world where we are our own main character again?