It is good to learn as much as you can now, before you ahve another baby. While breastfeeding is "natural", it is something many of us have to work hard at in the early weeks.
My recommendation would be to read "the Womanly Art of Breastfeeding" by La Leche League, browse through the LLL web site for information (a good start would be http://lalecheleague.org/NB/NBearlyweeks.html ), and attend meetings in your area. http://www.lllusa.org/FL/groups/index.html The nearest group might be the next county over from you, but you might find it worth the drive to meet other moms who have overcome similar problems. Check to see also if the hospitals or WIC in your area have breastfeeding support groups.
There are many things that can affect milk supply, including medications during birth, premature birth, c-section, induction, epidural, IV during labor, medications after delivery, improper latch, weak suck, breast reduction surgery, scheduled feedings, dehydration, stress, lack of sleep . . . and the more of these going on at once, the harder it may be.
Just a note with the intake scales the lactation consultant uses - that can be a good way to see how much a baby is getting at a particular feed, but that does not mean the baby is always getting that amount. That is just a measure of that individual feeding. And if you tried to use the sale all day, you'd drive yourself nuts. The best indicator of intake is output. In the first week, the number of wet diapers should equal the number of days old the baby is. Poop can vary, but it is normal to see at least 2 per day.
Please don't continue to feel guilty about not breastfeeding your baby. You did the best you could with the information and help you had and ultimately made the best decision for your circumstances.
I wanted to mention also about the family history of breastfeeding issues. This is actually very common to hear. Many women have had true difficulties, but there has also been a history in this country of misinformation. Doctors for a few decades would have women express milk into a vial and then the doctor would hold it up to a light to see if it was good enough. Women were instructed to feed on 3 or 4 hour schedules which often leads to a decreased supply. And there are other external factors through our history that has made breastfeeding difficult or impossible for many women.
My mother was not breastfed and she did not breastfeed her babies. My sisters were unable to breastfeed due to c-sections, medications, bad advice, etc. It was a real struggle for me with my first, but I found the support I needed to get through the bad latch, supply issues, and self-doubt.