You did what was best for you at the time. I did the same, expressing every few hours for 15 weeks. DS had tongue tie. He wouldn't entertain bfing even after it was rectified, even with shields, babymoons, skin to skin, I tried it all.
The supply was there, the demand was there - we just had a problem with distribution!
DH had to do the nightfeeds while I expressed the next one, to "get ahead" by one feed every time.
Then there's the storing the milk, sterilising the bottles and the pump, getting chilled milk to the right temp, blah blah blah, so exhausting and that's before getting round to feeding the milk to the little blighter!
It came to a head for me when I realised I was spending up to six hours a day hooked up to the dairy farm, as I called it, before all the other stuff. DS was just feet away on his baby gym but may as well have been in a different room. I wanted to be with him, not just observing.
So I gave up. The difference wasn't huge, but it mattered. But I honestly don't think it mattered to him, iyswim. It was also a case of giving myself permission to stop. I had to accept that I'd done enough, when deep down I felt that I hadn't done enough. I bloody well had!
Looking back now, its a bit of a blur, not sure how we functioned. But isn't it the same for all new parents?
I really don't regret doing it, neither should you.
Don't feel bad about your choices, accept that what's done is done and enjoy your baby! (sorry, long!)