From breast to formula

So I’m conflicted, I kind of want to wean my baby (he’s seven and a half months old) off me because I don’t think he’s getting enough like he’s so fussy and hungry all the time and while I’m at school I can’t pump enough to even feed him for a day so I’m having problems getting the daycare enough milk for the week. I kind of mentioned it to the dr When we was there earlier and she kind of made me feel guilty for wanting to wean him like I was selfish for considering putting him on formula which bothered me and has me confused now cause I don’t want to hurt him by putting him on formula but I also want him fed too. I was planning on starting to wean him this week but now I’m not so sure. Anyone got any advice?