Fed up of being single, broody and fed up of a dry life?

Everyone I know is settling down, having children or getting married. I can't even seem to develope a relationship. because I am sure the guys I attract are the wrong ones. At 31 the way my life keeps going, I do often feel like killing myself. I'm often called attractive and a lovely person. A lot of ppeople are surprised I'm single and I just expect that is all I will be. I keep looking babies and young children wishing they were mine or I wish I had a partner who cared about me.