What if I’m a bad mom?

I’m only 18.  I shouldn’t be so worried about this.  Why can’t I stop thinking about this?  I’m so afraid that I’ll mess up when I do have a kid.  I’m afraid that I’ll neglect it.  I’m afraid I’ll care more about myself than I do my child.  I’m afraid that my child will love its babysitter more than it’s mother.  I’m afraid I’ll lead the child down a path it was never meant for.  I’m afraid I won’t be the mother I could or should be.  But it’s more than that.  I’m afraid I won’t be able to have a child.  I’m afraid I’m barren.  I’m afraid I’ll miscarry.  I’m afraid I’ll slip and fall and my baby will die but I was so close to labor that I’ll have to give birth to a precious child that will never get the chance to live.  I can’t get these thought out of my head.  I’m only 18 years old.  These thoughts are not the kind that should be filling my mind.  I don’t know what to do.  I don’t know what to do.