IMO i htink you should ignore that girl who thinks you were not strong enough to have the a/b!! it takes a stronger person to bring a baby into the world!!
my mum has my brother at your age and me 2 years later so i dont hink the age thats the issue, its your mindset! if youre confident you can have this baby to hell with everyone else that thinks you cant!! youll be a great mum and havign your mum due near you you will have somebody who wil be going thru the same things as you and can relate at exactly the same time!! plus she can give you heaps of pointers!!
i have always been told by my grandfather that true friends will stick with you no matter what happens in life, if anybody leaves you then they are not true friends!! cherish the ones that cherish you.

stay strong and healthy!!

lisa