I had problems BF-ing first time around and the one thing I really wish I'd known was that it's really important to put your baby to the breast VERY often in the first few days. Sorry if it sounds totally obvious but I was clueless and it contributed to feeding problems for my twins. Ended up losing weight and dehydrated - had to go back into hospital to get sorted, felt like worst mum ever. The midwife who sent us back to hospital was so helpful in terms of getting me sorted with a good position to sit and BF, getting the twins latched on, telling me that no, I didn't HAVE to tandem feed, just feed one at a time. I just wish I'd had some advice and support from her a couple of days before when I really needed it. The staff at the hospital were too busy to help with that stuff despite me asking and saying I didn't think my milk had come in, their breastfeeding counsellor was on leave when I delivered / recovered, etc etc... On top of all that, I was scared that giving ANY formula would hinder BF-ing.
Next time around (twins again) the hospital staff were amazing in terms of getting me to do a feed almost the second they were born, helped me by bringing babies to me to be fed instead of me having to lift them up myself post-C Section, and perhaps most improtantly, I knew what to do and that I could do it - and it was so much more enjoyable and less stressful. The first night, I also insisted on giving them a little bottle of formula milk too - explained my previous experience and said I wasn't going to risk babies getting dehydrated if they weren't getting enough from me. MW very understanding and didn't try to dissuade me, though she did say it probably wasn't necessary. With hindsight, she was almost certainly right that I didn't need to give any formula but it gave me the confidence I needed.
It's worth asking your local Children's Centre / NCT group if they run any breastfeeding workshops. The more you see women BF-ing their babies or just being able to talk to them about it, the more confident and clued up you'll feel when it's your turn to do it.
Basically, it's up to you how you feed your child - don't be put off by the fact that your friends and family haven't done it. Even if you do it for a fairly short time, there are still big health benefits for your baby (and for you!) but also, don't ever let anyone make you feel guilty if you want to give formula sometimes.
Finally, BF-ing is soooo quick and convenient compared to the faff of making up bottles of formula, having to sterilise the bottles, etc etc. And it's free!