I'm happy for her but for myself

Okay I have a friend and we both been trying to get pregnant with our husband. We was not able to do so for two years so last year we said this is what we will do. Let our husband go gets they sprem tested her husband was low and my husband was not. Okay now we went to get a tube tested both of my tube is open and her one is block. So I told her that she can still have kids just that we are not having sex the right time. Let us both get a ovulation kit. So she didn't understand it so I walk her thur it everyday by the phone what to do and when to do it with her husband. Now she is having a baby and I'm happy for her but I'm still wondering to my self why is it that I am unable to have a baby. And what I told her I do it with myself the only thing is that my husband when we do it once he can never go again and I try everything to start him up again but he say that he can't make it and he's to tired and it's all because he works hard at his job. I don't know what to do anymore.