Feeling overwhelmed and guilty...

My babygirl is a month old and i am exclusively pumping. I tried to nurse her directly while in the hospital but it gave me a lot of anxiety not knowing how much she was eating and if she had a good latch or not. So i have been pumping and bottlefeeding. We also had to supplement with formula due to me not producing enough to begin with. Now a month later I produce about 4 oz on average every 4 hours. I feel guilty though because I dont know how much longer i can keep pumping. I feel like it is an extra step and im always worried about leaving the house because i dont know how long i will be gone. I also have had horrible mastitis about a week ago and am constantly getting clogged ducts. I dont know what i am doing wrong, but it is overwhelming me and i dont know what to do, because i am in pain, overwhelmed and tired. I planned to pump until she was 6months, but now i just don't know.