Is This Really MY Life?

It just dawned on me last night that I have a life full of regrets. I have no idea what to do about it or where to go from here. I'm only 37 years old, but I'm at that point in my life where I'm starting to panic because NOTHING is the way I want it to be. Am I going to grow old alone? Am I going to regret the fact that I never had a child? I don't want to live my life this way, but I can't control my thoughts or my feelings. I'm sad and I literally just realized that I don't know if I've ever been truly happy. I'm good at holding everything inside and putting a smile on my face, but I'm tired. I just don't know where to go from here.