I've learned to think in terms of having a long career. Actors can have very long careers that last until the day we die but there will be moments when you'll feel like you're a failure or when you're disappointed in yourself.
Don't force your kids into sports. I never was. To this day my dad has never asked me to go play golf. I ask him. It's the child's desire to play that matters not the parent's desire to have the child play. Fun. Keep it fun.