I'm not sure what there really is to be scared of. You definitely have a lot to think about and consider. Children are not easy, and are very expensive. Do you work, drive, have your own place, pay all your own bills? Are you in a stable relationship, do you intend to spend the rest of your life with this person?
How you feel while pregnant is different for all women. Some are depressed, others are happy, some are scared, some are anxious, while others are mad.