AM I REALLY NEEDED?

I am not sure what's up - but I feel like the worst mother ever. I feel like A does not love or need me...I mean how much "love" can a 3.5 month old show - yet, every day I feel like I am not needed. Hubby tries to get to give myself a break, but I just can't do that...I wonder if all working mothers have this struggle or if I am just odd.