When I was young, I had a lot of opportunities to choose from. My teachers in high school often told me I would do great at a career in whatever subject it was they taught: my science teacher thought I should be a scientist, my English teacher thought I should be a writer, etc. I had some serious issues with self-esteem, but self-confidence in my mental abilities wasn't a problem. I had confidence that I could be whatever I wanted to be, career-wise.
Physical fitness... we all would do well to exercise, and while this is something I have struggled with in my life, I am looking forward to making physical activity a part of my life in a way that is enjoyable for me. I liking walking, hiking, snowshoeing, and cycling. I'd like to get better at running and I'd like to try some other stuff like yoga.
But even though sometimes I look forward with great anticipation to the time when I can pursue my own interests, I know when I get there I will miss this time when my arms are full of cuddly babies. And I will never regret a minute of it. I picked the right boat.