19 Years Old - Am I Too Young for a Tummy Tuck?

You are not too young for a tummy tuck.  It is not a great idea to have the procedure if you are planning on having a baby in the near future. Your stomach may not return to normal after having a child.

In your situation, having had only one child, I would suggest waiting on the  tummy tuck  if at all possible. If you're not planning on having children in the near future then proceeding with the surgery should be considered, given that it will significantly improve your quality of life (based on what you have described). Obviously taking this route may mean that further surgery may be required after you're done with pregnancies.

You will find that in the field of plastic surgery, every patient's  situation is assessed based on their unique circumstances, making it difficult to give generalized advice.

It may benefit you to seek consultation with a well-trained/ethical/experienced board-certified plastic surgeon for advice.

Best wishes.