There is NO reason you can't finish high school. You may not be able to continue tradition school. It may be a REALLY good idea for you to look into home school programs or programs for teen mom's. I am sure your community has something set up for teen mother's to finish their education while still caring for their infants.
One of the best things you can do for your child is to take care of it's mother.

You don't have to "end" your life to make a good life for your baby.
