There are going to be families everywhere. You can't stop taking part and enjoying GAL just b/c you see a couple out with their kids.
Next time, have a chat with yourself standing before a mirror. Speak as though you were talking to a friend. Tell yourself out loud that you are going to such & such place and expect to see couples and their children. Tell yourself that it is painful and triggers memories but it's a process every person faces when they are the LBS. Give yourself a pep talk. Challenge yourself. This might sound a bit silly, but it works well for a lot of people.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!