What a GREAT choice!
You probably won't find a bigger advocate for breastfeeding than me... it is the most wonderful bonding experience for you & your baby.
I breastfed both of my girls & would not have traded the time, effort, energy, & late nights that only I could do for ANYTHING.
Yes - for the first week it's gonna be uncomfortable. Advice: Get a lactation expert in your room at your birthing center ASAP after you deliver. They give really great advice on how to get your baby to latch on properly, etc. Also, get some Lansinoh - the BEST nipple cream. It's pure lanolin, (sticky stuff) and the absolute must for the first week - and after too. After about the first week, the pain subsides & it's just neat - as you both get to know each other.
You do not need to be nervous - nursing your baby is the most wonderful, natural thing a mommy can do! The only "downside" that I can see is that Daddy never gets to feed the baby... but we worked that out by letting Daddy do all the diapers!

He loved it. (Really!)
Kudos on taking the time & making the effort to do the mommy thing right... you will never regret it.
I'm happy to answer any first-time mommy jitters you might have...
one of my greatest joys - motherhood.