Switching to formula

I feel like I’ve failed as a mom… When did you know it was the right time to switch to formula? My baby is only eight weeks old but I don’t know how much longer I can go. I would have loved to of made it to a year and then when I realized how hard it was to pump (bad latch), I said I would make it to six months. I am a low supplier and yes my flange size has been checked. I drink my water and I eat my calories, but it’s just not working. I’ve been giving my baby breastmilk with formula in it, but I don’t wanna keep making myself miserable, knowing that I can’t fully provide just breastmilk. It makes me so upset but maybe it would be better for my mental health if I switch to formula? I’m looking into the European-based formulas.