Yes, that's normal. You sound as if you like to study. Other people like to go out and party a lot. Some people do a bit of both. As long as you're doing what you love and what you truly want to do, then you're doing the right thing.
Like nhaasch said above, don't be afraid to explore new things either. I've been doing this a lot in the past couple years and it has definitely enriched my life.
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