Back to work and I can’t stop crying

I’ve been back to work since late July and I’ve cried almost every day after I leave my girl. I’ve wanted to be a mom for so long and now I have the sweetest, most wonderful baby. Life at home is challenging but better than I ever imagined. But leaving her every day breaks my heart. My husband and I might be able to afford just his income— but it wouldn’t allow us to put any money into any savings accounts (college, new home, etc). I keep telling myself it is good for me to get dressed, get out of the house, and work. And it’s good for our daughter to socialize with other babies. But I also feel like I’m missing out on such a fun time with her. She’s almost 6 months old. I miss her so much every day. Is being sad for this long normal? What do you all do to deal with the sadness and guilt of being gone for 9+ hours a day?