Help..

How do you tell your significant other that you have postpartum depression..
It never seems like the correct time but I also don't want him to worry. 
Can anyone help me..
It's hit me hard and I just don't feel the same anymore.. I don't want to be around my baby, being around friends and family bugs me, I want to be alone but I want someone here, I want to cry but I don't think I'll be able to stop.. 
I feel lost and confused.. I just don't feel loved or wanted.. I don't want to be around my own baby because I'd feel like I'd be a bad mother because of how I'm feeling.. 
I can't give them the love they deserve.. 
My significant other seems to give the baby more attention than me and that's fine but he just doesn't seem to want to be around me in general..