I totally know how you feel!
When I decided I was going to lose weight, at 185 pounds, I had set 140 as my big first goal. And when I reached it, well, there is no doubt that I was happy, but most of all, I was more in a state of ''okay... what now?''
It feels you've been focusing on weight loss forever and suddenly, you don't live on this purpose anymore. So weird...
I kinda went around this issue by figuring out that my body was not quite where I wanted it to be anyway (yet). So I guess I have to figure out what to do with myself when I'll finally be okay with how I feel about my body