unprepared

When i got pregnant at 17 years old i could not even comprehend the challenges i would face I was so busy researching trying to learn to take care of a new born, that i completely forgot to start learning how to deal with a toddler , then a 4 year old,5,6,7, etc...Now i have found myself 2 weeks from my 22nd birthday with this feisty, loud mouthed, amazing, and hilarious little boy who teaches me something new everyday. I love him with all my heart he is what keeps me going, but this job ive been given as a mother its hard and its scary, when i was younger in my teens i used to say "its hard and scary" from a selfish perspective as in its hard because i lose my freedom and scary cause i have to grow up, but honestly i dont feel that way anymore its hard because i want to raise him right and who is to say which way is right?, and its scary because I am terrified of letting that little boy down. Its my job to love him, protect him, teach him right and wrong, make him laugh and smile, make him better when he is sick, but what if i fail???  So everyday it feels like i have to make a new big decision about what is right or wrong or good or bad for this little angel i have been blessed with. Yesterday i was faced with the hardest one yet...How to discipline??? All i know is spanking is out!!!