I have no family near me at all either. I also had my first child shortly after moving to a new town and starting all over. I searched out groups where I could meet moms with children the same ages. The breastfeeding support group at our hospital turned out to be a lifesaver for me. Over the years I have met more than a dozen moms who I feel close to and know my situation (many share similar situations) and we are able and willing to care for one another's children if the need arise. We don't feel guilty, we all know that it is simply a part of parenting when you don't have family around, which is pretty much the norm nowadays.
I have one close friend who has been an absolute lifesaver. She was the one who took my kids that night that my dh took me to the hospital. She took them the days I was in there so that dh could go to work some hours and not fall too far behind. She is my ds2's godmother and the guardian of our kids if anything happens to us. Yes, I met her at the bfing support group.
I'm not unsympathetic to your situation, after all, I've been there, but we have two choices in this world. We can feel sorry for ourselves, or we can do what is best for us and our family and try to help ourselves. I have to tell you that most of the new moms who come to the bfing support group are simply dying to meet someone with a child their age and form a friendship. They are in a new situation and want company.
Parenting is hard. The glossy advertisements and glitzy magazines don't tell you that. It is so hard to deal with a colicky, screaming baby day after day (my first was AWFUL.) But with patience and support we get through, and many of us actually decide to have second and third (pick your number) children. Unfortunately, most people are to afraid to go up to people and take the first step at friendship, even though they desperately need one too. Sometimes we have to take the first step. Best of luck, and check out that local LLL meeting in your area, or go hang out at the library.