Main message - you need to do what's right for you and your family.
My experience - currently have an exclusively breastfed 5.5 month old. First 12 weeks were horrendous with colic and silent reflux. I didn't have more than 40 mins sleep in one go for weeks.
I had mastitis in week 1. Breastfeeding was excruciatingly painful to the extent that I had to bite down on something when he latched onto bad boob.
My HV friend told me that breastfeeding for most people is hideous for the first 6 to 8 weeks. After that, something just clicks. She was right.
I'm so SO glad I persevered. It's so easy to be able to feed and comfort your baby at any time, anywhere. I also know I have given him the best start in life. He's such a happy little boy now.
With sleep, he's always gone in his own sleep space at night, no co sleeping and no next to me crib. Difficult at first, but since 8 weeks he's had massive chunks of sleep and now sleeps 10 hours in one go.
In the day we do a mixture of pram, carrier and contact naps and have done from the start.
If you haven't already, get a sling. Absolute game changer.
Don't be fooled into thinking that formula will magically help them sleep. I've had friends who have been caught out with this. We've not used a dummy either as we didn't want to wrestle it off him at 6 months. It's easy to breastfeed back to sleep at night once you're into the swing of things.
Trust that it will get better and if you really feel strongly about it, ask your HV for guidance and follow all the breastfeeding accounts on Instagram that you can find!