For me, being a father has been the absolute highlight of my life. I've been lucky to have a DS and DD who are great kids. They're in the higher education stage in life so I do worry about them being happy in their lives, but so far so good.
My relationship with my kids has honestly been magical. I have so many incredible memories of things we've done together. Even the small things, the chats with my daughter at bedtime, the expression on their faces when I told them stories. It's unlike any other relationship I've had. A friend once told me that he felt his soul, and his kids souls, actually came together and touched. I understand what he meant.
I absolutely threw myself into fatherhood. Made them priority one in life. I made new parent friends which opened up new activities and social scenes, but it did mean sacrificing my life to them, in a way. I know there are other parenting styles, but that was mine. I saw some friends enjoy their kids as much as me, and some who seemed to find it much harder work. I feel I was a "natural" father, it came easy to me. Maybe because I had a good relationship with my own father? I think if a man has no example to follow it might be harder, but I accept this is not a hard and fast rule. Men with poor male role models who enjoy fatherhood have my utmost respect.
Now I emerge blinking into my fifties, looking to find who I am, I do realise my sacrifice to them came at a (small) cost. I could have pushed my career harder, I could have learned skills and hobbies, I can't play golf. Maybe I can learn now.
Despite how much I loved being a Dad, I can't advise you. Before you become a parent you really have no idea what the experience will be like for you individually. The evening I left the hospital and my wife and newborn DS, I lay in bed and tried to grasp the enormity of what lay ahead. I remember my spinning head. My life changed permanently that day. But for the better.