I'm 36 and feel Ill never have a child

I'm 36 and have never had a child and feel that it's getting to late for me in life.  We have been TTC off and on for several years now. I get very depressed when I see everyone around me having babies and nothing is going on with me. I havebeen to a couple of docs they don't seem to be concerned. One obgyn told me a was to heavy to conceive, I'm only 205 yeah I might be overweight but they seem not to understand how hard it is to get the weight off.  Just rambling and feeling lost and depressed.