Scared mom

So my friend is 15 and pregnant and i will be afopting her baby when its born (im 18) its a complicated process being this age and in different states but my mom is helping anf will do anything to get this baby, because its me or abortion. I have always told myself im gonna be a good mom and how i will raise my kid but now that im gonna be a mom in just a number of months im worried i wont be a good mom, and you never relized how much those thoughts come to mind until you have a kid on the way.