You post breaks my heart but it is so depressing and negative. I know it sucks, but no one wants to connect to a negative melancholic person who goes on and one "I have it harder than you, poor me, you do not understand"
What do you know about other people lives beyond FB posts? Someone might have husband every night at dinner or housekeeper every week, but suffer deeply from a serious painful condition or a loss of a loved one which is still fresh int heir memory after all those years. Perhaps they are happy but have to deal with mentally ill child.
We all suffer in different ways. You do not think they will understand you/? How much do your understand them.
Do not wait for people to email you. Email them. Organize a tea or play at home. Get a babysitter and invite a few people to go to movies with you. Organize babysitter co-op so you have time to go out and to pursue some activity with others. Sit down with you DH. Maybe he can get a different job, and you can work aprt time at some point so his house do not have to be so long..
Lower you expectation and accept differences or you will spend your entire life with just on BFF, you reflection in the mirror.
No one will be up to your family standard ever, neither parent nor adults.
Diversity is spice of life. I have friend who are homeshoolers, Christians, Budhists, CIO and co sleepers, pagans, hippies, Republicans and Liberals, polyamorist mean eaters and monogamous vegans.
Accept people for who they are not for what you want them to be and you will find Friends! Same goes for your friend's kids.