Am I too young??

I was wondering when a good age is to starting a family?? I am 19 turning 20 in 3 months, I feel that starting a family at a young age would be a good thing considering you can grow up with your children and not be too old and unable to do such things with them like sledding, playing outside with them, just being able to have fun and grow up with them. Also How do you know if you are ready or not to have kids??? Very curious if I am too young or not??