Will it ever happen?!

Had my last depo shot oct 2014 only had 3 injections were now coming into 2016 and still not pregnant..my fiance is going to be 47 im going to be 32 and feel like we've hit a dead end..so frustrating i just wanna cry, yes im happy others are pregnant but just wish i would have known about all these problems i'd have after the depo..starting to think i should just give up :(