When I lost my mother, I felt the same way you felt. That you wish this person was around to better help you learn how to take care of yourself. Like those who say they care about you are either using you or mocking you behind your back even among your closest friends and family. Sometimes I still feel that.
However one thing you got to realize is that they never had to learn much from their own family either and what they pass onto you is what they themselves learned through trial and error. You could be dirt poor or rich as Hell and that same problem persists. My mother taught me as much as she thought I needed to know to survive and it was up to me to fill the gaps. A lesson I continue to struggle to this day, but for her sake and the sake of others that have helped me over the years, I never give up. Find people you can trust and love as much as you love her and you'll take on the world.
As this song says Life Goes On. Don't let it go on without you. This song is a testament to that.