Have you ever feared that you will never be content/happy?

The last few months of my life have been pretty much one big emotional rollercoaster. I can’t make up my mind who I want to be with, or whether I want to be with anyone at all. It seems like every time I make a decision that I think I’ll be happy with; I change my mind after a short time. I wonder if I’ll ever just be happy and content with my life or if I’ll always want what I can’t have. Anyone else feel this way? Any advice?