So sorry to hear that you feel so under pressure. I think by this point in your pregnancy everything can feel like too much. My MIL was a nightmare, not about breastfeeding but over everything else! I thought she would show up for the birth at one point
As you said, everyone is keen that you breastfeed, the books, the midwives and usually well meaning friends so its good to hear you family and friends are supportive.
Its really important that you do what feels best for you. A new baby is great but you'll be tired and full of emotion and you need to feel comfortable with your choices.
While I was pregnant I was not keen on BF the thought of it just didn't appeal and I couldn't imagine myself feeding my baby, all be it discretely, in front of family or friends or in public. For me, I decided that I would give it a try but told my MW and husband that if it wasn't right for me then the baby would be formula fed. (I probably thought that I would give it a go, be repulsed and that would be that.)
Apart from the first couple of days of getting latching correct and sore nipples I found it incredibly easy and still BF my 10 month old. In a way, I will be sad to stop and not making up formula and sterilising bottles has made life so much easier.
No pressure is meant by any of this, just thought my experience and how I felt may be of some help.
Stick to your guns if Formula is really the route you want to take. Good luck.xxx