You are too young to have sex or a baby. Babies are a lot of work and responsibility and you are little more than a baby yourself and your parents responsibility. This is a time in your life for fun and parties and friends. All of that will be gone because you will be taking care of a baby. Not to mention your future, or the future of the young man who will father this child. Having a baby is not just about you. It affects many lives.
Ask your parents about going to the shelter and adopting a kitten or a dog. They are loving and is your first step in dealing with the responsibility of caring for a living thing.
Think of all the things you like to do. If you have a baby at this time in your life, those things will be gone.