> The final piece I learned with any aplomb was Mozart’s Violin Concerto no. 3 in G Major with a Sam Franko cadenza. The cadenza was a little beyond me: the fingering too tricky, my apathy too high. Playing it was like trying to grasp something just out of reach; with the next stretch, my ligaments would tear and bones would pop out of their sockets. This caused my teacher, my mother, and me angst in no small measure.
Mozart 3 is the first Mozart many violin students study, and this is where a lot of my violin mates quit, too. The problem---apart from the general problem with violin education---is that Mozart requires too much maturity in musicality. There's a reason major violin competitions usually require a Mozart piece at certain rounds, despite the relatively low technical difficulty compared with Romantic concertos or show pieces. The transparency of Mozart is a true test on how well a player understand the music, know how to phrase, and express themselves in an interesting but not peculiar way. A technically well-played Mozart can still sound like monotonous misery if the player doesn't have the ability to interpret it. So, it really only works for goal-oriented students (I've gotta win this competition), and is a chore for a lot of other students.
(And I say this as a big fan of Mozart's music)
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I wasn't a Suzuki kid, but a thing that I felt really envious about, is that a proper Suzuki method encourages playing with your peers to a degree. A Suzuki teacher is supposed to arrange duets, recitals, etc., and it is just much more fun to play with and for your friends, instead of the guy in the mirror.
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I'd like to point out that most of us don't retain every single hobby we attempted as a child. It is a natural outcome of growth, where we understand ourselves better, and learn to achieve happiness in a more strategic manner. I've seen questions by teenagers on violin forums, of such a kind: "I'm entering med school, and I'll be too busy to practice the violin. What should I do?" And just like some wise teachers pointed out, it's easier to be a doctor and an amateur violinist, than the other way around, so focus on your study first, and pick up the violin later when your life is less stressful.
It's fine to give up, for a while, or forever, or replace it with something else. There are many paths towards music, some are much easier or cheaper than others, and even music itself is not the only path to happiness anyway.
We all want to have unlimited time and have mastered all the skills in the world, but we don't have unlimited time, and most of the road to mastery is too long and too hard. It's worth it to sit down with yourself and ask whether this is something you really want, or is it merely the avoidance of cutting a sunken cost.