1st baby is not due til later this yr

I'm going to be a sahm. i worked my entire life. This has always been my dream! Now that I'm already not working though I feel so lost. I feel like I lost my identity and independence and tons of socialization. I feel depressed. I know I'll be much busier once baby comes. Can someone plz tell me what I'm in for? What its like? And that I'll be so glad I won't have to leave my baby. Tia!