Why is it easier to help others, but so hard to help yourself?

I have been so focused on helping my 11 year old daughter through her mood disorder and depression for the last 2 years, that I have not realized how much help I need. I went to therapy this afternoon and my therapist keeps suggesting medicine to help with my depression and possible mood disorder, but I keep ignoring that I need help. I guess maybe I feel like if I take the medicine that it might mean that I am weak and then cannot help my daughter. I have a large family that needs me and I don't want to admit that I need help. I wonder why that is? Why are we so worried about admitting we need help. I tell others that it is okay to admit it. I really need to take my own advice.