Daycare Fears

I had my son in September and at the end of this month I go back to work and he starts daycare and I am absolutely petrified. I am so scared that because he'll be spending the majority of his day with a different person he'll come to like and trust her more. Like when he's having a bad night he'll want her to be there instead of me. I'm also hating the idea that I won't get to see or interact with my son much anymore. I get off work at 4:30 and he'll probably be in bed by 8. How do you deal with all this? Does it really get easier? Right now I'm wondering why I had a baby if I don't even get to spend time with him.