Hey Hun, first of all don't beat yourself up! Whether it's formula or breast milk your baby won't care as long as it's being fed! There is no need to feel so pressured- I know you must be disappointed but in the long run it doesn't matter. I was bottle fed as my mums supply ran out and I do alright 😉
If you want to keep trying- defo start expressing and giving occasional bottle- it will give your nipples a well needed break, plus gets baby used to a bottle early giving you freedom later. My LO has a bottle every other day since 2 weeks just to get her used to it- she switches from bottle to breast easier, dad loves feeding her, and I get the occasional lie in whilst he does a morning feed- win,win,win!
Lansinoh is the best nipple cream- doesn't make you greasy. Definitely worth investing!
If you haven't already got one a nursing pillow may help. Also try different positions- I found lying on my side on the bed is the position she latches on easiest.
As your nipples are damaged at the min it will hurt no matter what you do- however check baby is latched on properly- full cheeks, bottom lip folded down, ears wiggling as she sucks) and if not slip your little finger between you and her and pop her off! Don't let her carry on if you know it's not right.
But most important- baby picks up on you- if you are stressed and upset baby does pick up on this! I learnt this when trying to BF in public first few times- I was so worried about covering myself up etc- LO went mad, wouldn't latch, arms flailing etc which isn't like her at all. Now if I'm stressed and she's having trouble- take her off, soothe her, take a deep breath and talk to her in calming tones to soothe both of you, I.e "oh dear me sweetie let's try again" in the calmest voice possible- sounds mad but it works!!
If it's important to you it's worth persisting. Remember- all the things above will help but they are not magic cures- if changing position doesn't work first time, still try it again! It defo takes a bit of practice, but being calm and patient is the key xxxx