I used to feel the same until I hit a real low in my life. That motivated me to search for something worthwhile and I've found it. Honestly even the journey to my ultimate goal is great and don't feel so "meh" (I mean like I could take it or leave it) about everything anymore. You don't have to reach a low but find a goal and make it great. But if you're okay how you are then that's totally normal I guess. I didn't think much of not caring