Leather - I was in a similar position - but with dh's family. It was hell, I was vulnerable and I had to wrestle my ds off milk to try and feed him whilst she was perparing formula and sticking it in his mouth. I had to try and express at odd hours and stick in the fridge. My milk dried up basically and I just gave up the ghost and bottle fed. TO my horror the day after mil left I went out and ended up with milk all down my front - I coudbn't believe it that my milk was starting up again but it would have taken a long time to again establish it.
I'm bitter but I moved on - there are so many lovely parts to lo's growing up and ds was perfectly healthy on formula. I just feel cheated personally - but that's my issue.
I don't see difference in ds;s health - it made a horrible difference to me as I knew he'd be my only child. I actually gave him some formula in hospital as my milk took ages to kick in and he was tiny and it was hot on the ward so I insisted on some formula for him.
"I didn't experience any of the problems associated with BFing: no pain; no exhaustion; no mastitis; no cracked nipples; no latch problems; my DD only woke up once a night to feed until she slept through from 5 months; I went everywhere with her and fed her in all sorts of places (cafes, restaurants, parks, at ILs', church, Chelsea Town Hall) with no problems. It wasn't time-consuming, it wasn't difficult, it was enjoyable and I am not a hairy lentil weaver still feeding a teenager: DD1 self-weaned at 10 months. And I lost all the baby weight within 6 weeks while eating pasta and chocolate. And drinking an occasional glass of wine. It can be easy, it can good!"
And it can be tricky - in my case I had something like 30H breasts that sagged and I could not feed ds in public - I could literally only feed him at home in bed and on my side for his own safety. I found it hard to get mat bras in my size on the net (I had cs and was pretty much housebound after for a while)) - I had two expressing kits and they both broke etc. Not easy for everyone and don't think you are failing because it doesn't come easy to you. My ds was crap at feeding and so was I. I was busy, getting shit for mil, not eating and drinking very well etc so I don't suppose my milk was top notch either.
It's easy for some and not for others.
My advice is do what YOU want inspite of advice and inspite of pressures from anyone either way.