Being lost isn't the opposite of comfort, happiness..it's about contentness.
I am like I am, and I like it.
That sentence tells me I am content with myself, I feel that even though people are having more fun than me, cash than me, etc...I am content with what I have, and what I did.
Being lost to me means I don't feel this contentness I have when I can rest at home. Contentness iss partially involved with the purposes, but only if these purposes make you think: YES; I am glad that I can do this.
So right now to me it seems you lack this contentness, be it due to stress, unhappy events which spoiled the formally fun purposes, and so on.
Edit: The only advice I can offer is:
Try to do things you haven't done in ages, or experiment, try to do new things. However, it is unlikely that doing what you currently do will help you Rediscover or discover something- that often helps.