Scared to give birth?

Alexis • 16 yrs old. First time mom. Having a boy💕. With my partner💋.
Im 16 yrs old and this is my first baby I'm so scared to go into labor what will happen..I'm a very small girl I weighed 98 pounds before and now I weigh 117 I'm 4'10 and I'm 24 weeks help? Any advice