Can I just get this off my chest?!

Why can't those who don't want kids be infertile and those (like myself) who would do or give anything to even have one child not deal with the struggles of infertility?? Sorry I'm having a really hard time with this... was basically told today kids in my future are not likely... please don't say "adopt" or "foster" we can't afford adoption and fostering is just that where I live... you give an older child who's almost 18 a place to live until they are legally an adult and move out. All other possible options for us to have a baby is too expensive to do for us.