Feeling Guilty-weaning from breastfeeding

My LO is 4 months old now, and I go back to work in a few weeks. pumping at work is going to be very difficult, so I made the decision to wean from breastfeeding and go to formula/stored breastmilk (till it runs out). Starting out with breastfeeding I had plugged ducts, mastitis, cracked nipples, bad latch problems, over supply, you name it. BUT, my LO and I made it through all of those hurdles and the last couple of months have been beautiful. I feel extremely guilty for choosing to wean now...I know it will save us both a lot of stress in the near future but I can't help but question if I'm doing the right thing 😥