Normal weight issues?

So at the beginning of the summer I weighed about 116. Now I weigh about 113, and it fluctuates during the day, everyday, but that's the average. Like in the mornings I weigh 112.5 and by night I weigh 113.8. It seems those numbers keep going down, one week it fluctuated between 111.2 and 112.8. I'm only 5'4". Is that something normal that happens? It just changes all the time, so I'm not sure...And I'm always worried about my weight. I don't know if that's good or bad lol I'm not on any diet or anything, I eat plenty, though I am really picky about what I eat.
Normal weight issues?
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