Feeling emotional

So I’m 1 week postpartum & I’m so emotional . I love my baby more than anything but I feel like such a crap parent . My partner is brilliant with him . He does all the feeds & changes him well , whereas I feel crap at changing him & i wanted to start feeding him more so I done it tonight and baby just projectile vomited everywhere . I just felt like I’m so useless & just cried . I’m just so scared that when my partner goes back to work after next week I won’t be able to cope .