Childlessness depresses me

Childlessness depresses me
Photo is illustrative in nature. From open sources.

I am 32 years old, married for 8 years, but I can not get pregnant. I look at others and understand that they have had children for a long time, but we can’t do it. Sometimes I begin to realize that I don’t see myself as a mother at all - neither my own nor adopted children.

I'm not ready for kids. Maybe I'm still a child inside, although the age is not childish. Sometimes I think that life without children is good. And sometimes there is such a longing in my soul, I think that it makes no sense to live without children. And at the same time I do not see myself ready for them.

How to overcome mental discord? Or just bide your time?