Do you ever feel like you have no purpose in life?

I mostly do. I really don’t knowwhat I really want. I feel like I’m left out. I’m now old but still didn’t reach anything. I’m lost and alone. And I don’t have the courage and will to do anything to get out from this situation or feeling. I don’t know what’s wrong with me? I don’t know why or how I end up like this. I just want to evaporate.