Am I going through a mid life crisis?

[Alion]

There's nothing wrong with you-it's natural to want to connect with people. Being a single mother,you're probably very busy and don't have a lot of time to meet new people,your parents are not an option from what you've said,so getting in touch with old friends sounds like the way to go.
Facebook can be a good way to do that-I've only been on it for a year and have already been in contact with people I haven't seen in years,in some cases decades. I think you're doing the right thing,taking steps to reach out.