Good, but not good enough

I wish that I knew what I was passionate about so that I can have something to keep me going. I find lots of things interesting, but nothing life-giving. I'm good at a lot of things, but not great at anything in particular. I was good at sports, but not good enough to play at a college or professional level. I have above-average intelligence, but I'm not a genius. I'm tall, but rarely the tallest in the room. You get the point.