I dont feel anything?

I have no happiness in my life. My frustratingly slow progress and constant feeling of being in a Catch 22 has depleted my ability to appreciate the good things in life. I am neither happy nor unhappy, I just exist, trundling along on a life that I can't seem to kickstart. I see amazing things and I know they should make me feel good, but that dry feeling of complete neutrality remains in my stomach. I miss the times when I felt joy, happiness and satisfaction. It is this lack of emotion that has made me unmotivational - I'm doing less work and I can't be bothered to practice the things that I'd like to get good at. I feel lazy and unappreciative of the things that I have. I go out with friends, have a laugh, but don't feel genuine happiness. I feel like a robot that behaves just like a human, but is unable to feel emotion. I look at the people who have colourful, exciting lives who have the motivation to keep improving - I wish I had those feelings and that motivation again.