When I switched to formula after breastfeeding failed with my first, I felt like I had to justify it to friends and family. We decided to exclusively FF our second (currently 10 weeks in) from birth and I don't feel that way at all now. I definitely have more perspective on infant feeding as a second time mom.
I should add that no one actually made me feel bad about the choice to use formula but I was afraid of being judged. What about you?