Hi Juana, this is a good place for you to be. There are a lot of experienced Moms here as well as many ladies who are in your age group. I'm sure you will find comfort - and comedy - reading through the posts. There are many books that can help you along the way; start with the ever popular "What to Expect While You're Expecting" and I myself have just finished "Happiest baby on the Block", which was a very eye opening read for me, even though I already have a 4 year old.
Are you getting prenatal care? You should always keep a list of questions you may want to run by your Dr. or health care practitioner and they will be great and helping ease some of your tension.
Do you have a good personal support system in place? Parents, friends, the baby's father?
Never be afraid to ask questions regardless of how ridiculous it may seem to you - trust me you are NOT the first person to ask it.