Worried FTM

Hi mummies, I'm a ftm and a pretty young one too - 22yo. I'm worried im not able to cope caring for my LO all by myself! My mother has to work as well as my husband, and I'm left with my MIL. But i don't quite like the way she is n how she keeps doing/saying things as tho she wants to take my child from me (very long story). Should i just put my ego down n close both eyes n let my MIL take care of my LO or should i just take care of her myself? My concern is, sometimes my LO cries a lot when she's not sleeping and ive done everything -burping, changing diaper, feeding. but she still cries... which kind of stresses me n I'm so tired from pumping every 2hours if not I'll have engorgement which is also very uncomfortable.