I can relate. When I am really depressed I feel empty and it feels like I don't really like anything.

Well, "fake it till you make it" is another way of saying what you need to do. But there are other ways of saying it. I believe that at our core, our true self, we are all love, or peace to name it better. There are many books on this. So it is about connecting to that which we are originally, though it is very hard when our brains aren't wired the way our consciousness exists. This is a spiritual belief sort of so take it with a grain of salt. I believe there is truth in it but it is your version of truth that matters here for you.