Breastfeeding/pumping with twins

Hi ladies, how did those of you with twins get on with breastfeeding or exclusive pumping?

My twins were born at 34 weeks, and will be 4 weeks tomorrow. I breastfed one for 3 weeks (the other had tongue tie and couldn’t latch), the other had pumped breast milk, and for the last week I have just been pumping, as practically breastfeeding one was becoming impossible as she was taking so long there was no time to feed the other 😣

I’m now struggling with exclusive pumping too, I can barely keep up with what I need to produce for them both and it just feels so difficult, it is exhausting. I’m so torn because I know breast milk is great for them, and I am trying my best but it is so hard and I’m having a lot of guilt about how much longer I might be able to keep this up for with 2 of them.

Any words of advice?