I just dont know how to feel..

It seems like every other day I find out that one of my friends I went to school with is pregnant... I want to be excited for them & I am but deep down inside I have this jealous feeling... I just keep asking myself why not me!? I see girls that are strung out on heroin or meth having babies left and right, people that obviously don't need to be having children anyways. And I ask myself allllll the time why is it that I have all the means necessary to have a child, not just financially but I'm In a commited 6 year relationship with a man who also desperately wants a little one & would be a GREAT father and its just not happening for us? We would be awesome parents but yet everyday there's women out here having babies that are already addicted to drugs because the woman was using during her pregnancy, & then you see stories of moms just abandoning there child in dumpsters & shit... Ughh, it just frustrates me beyond words.. Is anyone else feeling the same way???