I'm not a mom myself, but from the things I've heard from my friends (for the last 5 years unfortunately all I hear is baby talk), I would say just keep your options open and see how it goes. It's great that you want to try things naturally, but don't start thinking in advance that a natural birth is something that you MUST accomplish or that accepting pain medication would be a bad thing. There is no way to predict how your labor will go and sometimes pain medication càn be helpful, i.e. when the pain makes you anxious and you stop dilating any further. I had a friend who was stuck for hours at 4 cm and after she'd been given an epidural, she relaxed and progressed to 10 cm within the hour. Also it's always possible that there are some complications or the doc needs to perform a procedure where pain relief might be very welcome.
I hope I might one day have a natural birth as well, but I also feel that sometimes moms who've given birth naturally are a bit smug when all that matters is you and your baby are safe and healthy.
I disagree with the bolded. Obvious those are the most important things, but a good birth experience is important too, both for a woman's mental and emotional health and for facilitating the bond with her baby.
I think you might also be misreading 'proud' as 'smug'. I am proud I birthed the way I wanted - with no epidural or stronger artificial pain relief than gas and air. It was an achievement, one I planned for and put work into making happen. Luck obviously played a part too, but if I'd done no research or preparation it would've been very different, of that I have no doubt. I don't think I'm better than other people who have made other choices, I'm not smug.