avid
Very eager and excited about something you really love.
Avid means enthusiastic and dedicated, sometimes to the point of being intense about it. An avid reader always has a book nearby, finishes books quickly, and immediately starts another. An avid collector studies their items, organizes them carefully, and eagerly searches for new specimens.
The word suggests more than just liking something. Lots of people enjoy basketball, but an avid basketball fan watches every game, knows all the statistics, and probably plays whenever possible. An avid learner doesn't wait for assignments: they ask extra questions, read beyond what's required, and genuinely love discovering new things.
You can be avid about almost anything: an avid gamer, an avid gardener, an avid birdwatcher. The word captures that special intensity when a hobby or interest becomes central to someone's life. When you're truly avid about something, other people notice your passion and energy. You're not just participating, you're all in.