First time growing an auto flower

First time growing 3 auto flower seeds
1 seed didn’t sprout
2 seed started to flower after I topped it
3 seed is the one on the picture below already flowering, small plant.

I did some reading before I planted my last seed and I guess I’m either doing something wrong or it’s a bad seed. Unless auto flowers are supposed to be small.

I ordered more auto flower seeds to try again. I’m planning to grow autoflowers outside this summer.
Any tips on growing auto flowers so they don’t flower early indoor or outdoor. Or they do flower after a month… Any tips would beneficial.