Mom guilt

My son will be 5 months next week and has had only breast milk up to this point but since a recent growth spurt a few weeks ago has been taking A LOT more at each feeding. It’s fine when I’m home with him but when I’m at work he’s just been devouring his bottles. We have enough to get by one more week with frozen milk and then we will only have what I am able to pump each day which isn’t nearly enough. We met with the pediatrician who advised us to keep doing our best with breast milk and supplement when/if needed with formula. I had planned to exclusively breastfeed to a year and now I haven’t even made it to 5 months. I know it’s what we have to do but I can’t help but feel guilty about it. I feel like it’s my fault I’m not able to provide more even though I’ve done everything I can to build my supply. The mom guilt has definitely gotten to me. There’s been a lot of tears shed over this so far. My husband is very supportive but I feel like I’ve failed! 😔