I was really lucky with my breastfeeding experience, and I'm still doing it and loving it. A lot of people are able to breastfeed without any problems so don't be disheartened. Here's what happened with me, just in case it may help you at all.
First of all it was something I was determined to do, despite some negative views from family members and warnings of exhaustion (turns out it's not really exhausting as it releases hormones that relax you, you can also do it lying down and don't have to sterilise or heat any bottles!)
Secondly, our hospital was very pro-breastfeeding and the midwives there were helpful about answering questions and advising on feeding positions. When we were at home I was paranoid that my baby wasn't getting enough milk as she cried so often, but the visiting midwife assured me this was normal and that her weight gain was fine, (and the more you feed the more milk you will produce). She also checked that my position was ok and reassured me that it's normal for it to hurt a bit at first, and this gave me confidence.
Finally, it helped a lot that people in my anti-natal class were breastfeeding as well as two of my friends, so we could talk to eachother if we had problems. It was very important for me to have a bit of a support network, and this stopped me from giving up on several occasions. If you don't know anyone else who's breastfeeding there are helplines you can phone at any time for guidance (NCT, La Leche League and Association of Breastfeeding Mothers, to name a few), and there should be a local breastfeeding network near you.
Sorry to waffle on, I just wanted to add a positive experience. I hope it works out for you and good luck with the rest of your pregnancy.