returning to work???

Any new moms going back to work soon? My baby is approaching 3 months and I'll be returning back to work in 2 weeks. I'm so sad. 
I wish I could stay with her for a few more months.  I feel like I will be missing out.  I know staying at home is full time job as well but I   keep comparing my situation to those who do not work and are able to be with their babies.
It gives me so much anxiety. 
Share your thoughts, experience, encouragement .