@NatalieP92 - I promise it will get better.
I didn’t manage to breastfeed any of my three sons - ds2 ended up in hospital, with the staff muttering ‘failure to thrive’ because he lost 10oz off his birthweight, and hadn’t regained it by 6 weeks old. They didn’t let him out until I agreed to start supplementing with formula, even though I knew that would spell the end of breastfeeding.
Ds1 was on formula at days old, because he had jaundice, and I was told he needed the extra calories - and once his bilirubin was normal again, and we were discharged, I wasn’t able to re-establish breastfeeding.
With ds3, I mixed-fed from very early on - breast milk during the day, a bottle last thing at night and one during the night when he woke - but even then, he wasn’t gaining weight very fast (in fact, he didn’t gain at all unless he had at least two bottles of formula), and by 12 weeks old, he was fully formula fed.
I can remember feeling the way you are feeling - I beat myself up for ‘failing’ at breastfeeding for years - but I was wrong. Breastfeeding is a very good start for a baby, but it is only one of the many amazing things you can do for your child’s health and well being. You can wean them using home made food - I used to purée all sorts of fruit and proteins for ds1 - I froze them in cubes, and each meal was a variety of different things. I didn’t do this so much with the younger two, but I was cooking meals for ds1 that could be puréed for the younger ones. You encourage lots of activity and exercise, you read to them and do creative crafts, and play games. You help them with schoolwork, and encourage them to make friends.
And, if I am honest, you also let them watch TV and play video games, or turf them out into the garden whilst you have a coffee and a sneaky biscuit without sharing it. You don’t have to be perfect - none of us can be perfect, and trying to achieve perfection will drive a person insane.
Formula is not dreadful - I raised three boys on it, and they are all fit, healthy, happy, intelligent men now. I did my best, as a parent, and I am 100% sure you will do your best too - and it will be enough.
I used to worry that, because I wasn’t particularly good at encouraging the boys to paint and draw, they would fail every single exam they ever took and would amount to nothing - and nothing would have been further from the truth. Worrying is part and parcel of being a mum, but it is important not to let the worries take over. When they are grown up, you look back at all the things you worried about, and you see that they aren’t the major worry you thought they were.
All of which is a very long winded way of saying you are NOT a failure for not breastfeeding, you are a wonderful mum, and your lovely baby will be completely fine.